diff --git a/1-js/01-getting-started/1-intro/article.md b/1-js/01-getting-started/1-intro/article.md
index 591a4c831..51f922759 100644
--- a/1-js/01-getting-started/1-intro/article.md
+++ b/1-js/01-getting-started/1-intro/article.md
@@ -1,6 +1,10 @@
 # Eine Einführung in JavaScript
 
+<<<<<<< HEAD
 Mal sehen, was das Besondere an JavaScript ist, was wir damit erreichen können und welche anderen Technologien gut damit umgehen.
+=======
+Let's see what's so special about JavaScript, what we can achieve with it, and what other technologies play well with it.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 ## Was ist JavaScript?
 
@@ -26,7 +30,11 @@ Verschiedene Engines haben unterschiedliche "Kodnamen". Zum Beispiel:
 
 - [V8](https://en.wikipedia.org/wiki/V8_(JavaScript_engine)) -- in Chrome und Opera.
 - [SpiderMonkey](https://en.wikipedia.org/wiki/SpiderMonkey) -- in Firefox.
+<<<<<<< HEAD
 - ...Es existieren auch noch andere Kodnamen wie "Trident" und "Chakra" für verschiedene Versionen von IE, "ChakraCore" für Microsoft Edge, "Nitro" und "SquirrelFish" für Safari, usw.
+=======
+- ...There are other codenames like "Chakra" for IE, "ChakraCore" for Microsoft Edge, "Nitro" and "SquirrelFish" for Safari, etc.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Die obigen Begriffe sind gut zu merken, da sie in Entwicklerartikeln im Internet verwendet werden. Wir werden sie auch benutzen. Wenn zum Beispiel "ein Feature X von V8 unterstützt wird", dann funktioniert es wahrscheinlich in Chrome und Opera.
 
@@ -107,15 +115,29 @@ Moderne Werkzeuge machen die Transpilation sehr schnell und transparent und erla
 
 Beispiele für solche Sprachen sind:
 
+<<<<<<< HEAD
 - [CoffeeScript](http://coffeescript.org/) ist ein "syntactic sugar" für JavaScript. Es führt eine kürzere Syntax ein, was uns erlaubt, klareren und präziseren Code zu schreiben. Usually, Ruby devs like it.
 - [TypeScript](http://www.typescriptlang.org/) ist darauf konzentriert "strict data typing" hinzuzufügen. TypeScript verfolg das Ziel den Entwicklungsprozess und den Support für komplexe Systeme zu vereinfachen. Die Sprache wurde von Microsoft entwickelt.
 - [Flow](http://flow.org/) fügt auch "data typing" hinzu, aber auf eine andere Art und Weise. Sie wurde von Facebook entwickelt.
 - [Dart](https://www.dartlang.org/) ist eine eigenständige Sprache, die eine eigene Engine hat, die in Nicht-Browser-Umgebungen (wie z.B. mobilen Anwendungen) läuft, aber auch in JavaScript umgesetzt werden kann. Sie wurde von Google entwickelt.
+=======
+- [CoffeeScript](http://coffeescript.org/) is a "syntactic sugar" for JavaScript. It introduces shorter syntax, allowing us to write clearer and more precise code. Usually, Ruby devs like it.
+- [TypeScript](http://www.typescriptlang.org/) is concentrated on adding "strict data typing" to simplify the development and support of complex systems. It is developed by Microsoft.
+- [Flow](http://flow.org/) also adds data typing, but in a different way. Developed by Facebook.
+- [Dart](https://www.dartlang.org/) is a standalone language that has its own engine that runs in non-browser environments (like mobile apps), but also can be transpiled to JavaScript. Developed by Google.
+- [Brython](https://brython.info/) is a Python transpiler to JavaScript that allow to write application in pure Python without JavaScript.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Es gibt noch mehr. Auch wenn wir eine der transpilierten Sprachen verwenden sollten wir auch JavaScript trozdem kennen. Es ist wichtig zu verstehen, was im Hintergrund passiert und was wir eigentlich tun.
 
 ## Zusammenfassung
 
+<<<<<<< HEAD
 - JavaScript wurde ursprünglich als reine Browser-Sprache entwickelt, wird aber mittlerweile auch in vielen anderen Umgebungen eingesetzt.
 - Heute hat JavaScript eine einzigartige Position als die am weitesten verbreitete Browsersprache mit voller Integration in HTML/CSS.
 - Es gibt viele Sprachen, die auf JavaScript "transponiert" werden und bestimmte Funktionen bieten. Es wird empfohlen, sich diese zumindest kurz anzuschauen, nachdem man JavaScript beherrscht.
+=======
+- JavaScript was initially created as a browser-only language, but it is now used in many other environments as well.
+- Today, JavaScript has a unique position as the most widely-adopted browser language with full integration in HTML/CSS.
+- There are many languages that get "transpiled" to JavaScript and provide certain features. It is recommended to take a look at them, at least briefly, after mastering JavaScript.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
diff --git a/1-js/01-getting-started/4-devtools/article.md b/1-js/01-getting-started/4-devtools/article.md
index 4aa9737c9..685ec1282 100644
--- a/1-js/01-getting-started/4-devtools/article.md
+++ b/1-js/01-getting-started/4-devtools/article.md
@@ -8,7 +8,11 @@ Um Fehler zu sehen und weitere nützliche Informationen über Skripte zu erhalte
 
 Die meisten Entwickler tendieren bei der Entwicklung zu Chrome oder Firefox, da diese Browser über die besten Entwicklerwerkzeuge verfügen. Andere Browser bieten ebenfalls Entwicklerwerkzeuge an, manchmal mit speziellen Funktionen, aber in der Regel lassen Chrome oder Firefox diese hinter sich. So haben die meisten Entwickler einen "Lieblingsbrowser" und wechseln zu einen anderen, wenn es ein browserspezifisches Problem gibt.
 
+<<<<<<< HEAD
 Entwicklerwerkzeuge sind leistungsstark; sie haben viele Funktionen. Zu Beginn werden wir lernen, wie man sie öffnet, Fehler betrachtet und JavaScript-Befehle ausführt.
+=======
+Developer tools are potent, they have many features. To start, we'll learn how to open them, look at errors, and run JavaScript commands.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 ## Google Chrome
 
diff --git a/1-js/02-first-steps/01-hello-world/article.md b/1-js/02-first-steps/01-hello-world/article.md
index 29353fc0b..bf3f77138 100644
--- a/1-js/02-first-steps/01-hello-world/article.md
+++ b/1-js/02-first-steps/01-hello-world/article.md
@@ -9,7 +9,11 @@ Als erstes, lass uns sehen wie wir ein Skript einer Webseite hinzufügen. Für e
 
 ## Der "script"-Tag
 
+<<<<<<< HEAD
 JavaScript-Programme können an jeder beliebigen Stelle eines HTML-Dokuments mit Hilfe des `<script>`-Tag eingefügt werden.
+=======
+JavaScript programs can be inserted almost anywhere into an HTML document using the `<script>` tag.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Beispielsweise:
 
diff --git a/1-js/02-first-steps/05-types/article.md b/1-js/02-first-steps/05-types/article.md
index 2c36d8c06..5ec0f7410 100644
--- a/1-js/02-first-steps/05-types/article.md
+++ b/1-js/02-first-steps/05-types/article.md
@@ -66,7 +66,11 @@ Mehr über das Arbeiten mit Zahlen erfahren wir in diesem Kapitel <info:number>.
 
 ## BigInt
 
+<<<<<<< HEAD
 In JavaScript kann der Typ "Zahl" keine ganzzahligen Werte darstellen, die größer als <code>(2<sup>53</sup>-1)</code> (das ist `9007199254740991`) oder kleiner als <code>-(-2<sup>53</sup>-1)</code> für Negative sind. Es handelt sich um eine technische Einschränkung, die durch ihre interne Darstellung bedingt ist.
+=======
+In JavaScript, the "number" type cannot represent integer values larger than <code>(2<sup>53</sup>-1)</code> (that's `9007199254740991`), or less than <code>-(2<sup>53</sup>-1)</code> for negatives. It's a technical limitation caused by their internal representation.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Für die meisten Zwecke reicht das völlig aus, aber manchmal brauchen wir wirklich große Zahlen, z.B. für die Kryptographie oder Zeitstempel mit Mikrosekunden-Genauigkeit.
 
@@ -81,10 +85,18 @@ const bigInt = 1234567890123456789012345678901234567890n;
 
 Da `BigInt`-Zahlen selten benötigt werden, behandeln wir sie hier nicht, sondern widmen ihnen ein eigenes Kapitel <info:bigint>. Lies es, wenn du so große Zahlen brauchst.
 
+<<<<<<< HEAD
 ```smart header="Compatability issues"
 Im Moment wird `BigInt` in Firefox/Chrome/Edge unterstützt, aber nicht in Safari/IE.
+=======
+
+```smart header="Compatibility issues"
+Right now, `BigInt` is supported in Firefox/Chrome/Edge/Safari, but not in IE.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 ```
 
+You can check [*MDN* BigInt compatibility table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt#Browser_compatibility) to know which versions of a browser are supported.
+
 ## String
 
 Ein String in JavaScript muss in Anführungszeichen gesetzt werden.
@@ -127,7 +139,11 @@ In diesem Kapitel werden wir uns eingehender mit Strings befassen <info:string>.
 ```smart header="Es gibt keinen *Zeichen*-Typ."
 In einigen Sprachen gibt es einen speziellen "Zeichen"-Typ für ein einzelnes Zeichen. In der C-Sprache und in Java heißt er beispielsweise "char".
 
+<<<<<<< HEAD
 In JavaScript gibt es so einen Typ nicht. Es gibt nur einen Typ: `string`. Eine Zeichenfolge kann aus nur einem oder mehreren Zeichen bestehen.
+=======
+In JavaScript, there is no such type. There's only one type: `string`. A string may consist of zero characters (be empty), one character or many of them.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 ```
 
 ## Boolean (logische Werte)
@@ -254,6 +270,7 @@ Die letzten drei Zeilen bedürfen möglicherweise einer zusätzlichen Erläuteru
 
 Es gibt 8 grundlegende Datentypen in JavaScript.
 
+<<<<<<< HEAD
 - `number` für Zahlen jeglicher Art: Ganzzahl oder Gleitkommazahl, ganze Zahlen sind auf ±2<sup>53</sup> begrenzt.
 - `bigint` steht für ganze Zahlen beliebiger Länge.
 - `string` für Zeichenketten. Eine String kann aus null oder mehreren Zeichen bestehen. Es gibt keine separaten Einzelzeichentyp.
@@ -262,6 +279,16 @@ Es gibt 8 grundlegende Datentypen in JavaScript.
 - `undefined` für nicht zugewiesene Werte -- ein eigenständiger Typ mit einem einzelnen Wert `undefined`.
 - `object` für komplexere Datenstrukturen.
 - `symbol` für eindeutige Kennungen.
+=======
+- `number` for numbers of any kind: integer or floating-point, integers are limited by <code>±(2<sup>53</sup>-1)</code>.
+- `bigint` is for integer numbers of arbitrary length.
+- `string` for strings. A string may have zero or more characters, there's no separate single-character type.
+- `boolean` for `true`/`false`.
+- `null` for unknown values -- a standalone type that has a single value `null`.
+- `undefined` for unassigned values -- a standalone type that has a single value `undefined`.
+- `object` for more complex data structures.
+- `symbol` for unique identifiers.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Mit dem Operator `typeof` können wir sehen, welcher Typ in einer Variablen gespeichert ist.
 
diff --git a/1-js/02-first-steps/06-alert-prompt-confirm/article.md b/1-js/02-first-steps/06-alert-prompt-confirm/article.md
index ca2cd8b6c..ee90b3313 100644
--- a/1-js/02-first-steps/06-alert-prompt-confirm/article.md
+++ b/1-js/02-first-steps/06-alert-prompt-confirm/article.md
@@ -4,7 +4,11 @@ Da wir den Browser als unsere Demo-Umgebung verwenden, wollen wir einige Funktio
 
 ## alert
 
+<<<<<<< HEAD
 Diese haben wir bereits gesehen. Es zeigt eine Meldung an und wartet darauf, dass der Benutzer "OK" drückt.
+=======
+This one we've seen already. It shows a message and waits for the user to press "OK".
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Zum Beispiel:
 
@@ -30,8 +34,13 @@ Es wir ein modales Fenster mit einer Meldung angezeigt, ein Eingabefeld für den
 `default`
 : Ein optionaler zweiter Parameter, der vor-befüllte Wert für das Eingabefeld.
 
+<<<<<<< HEAD
 ```smart header="Eckige Klammer in der Syntax `[...]`"
 Die eckigen Klammern um `default` in der obigen Syntax bedeuten, dass der Parameter optional, nicht erforderlich ist.
+=======
+```smart header="The square brackets in syntax `[...]`"
+The square brackets around `default` in the syntax above denote that the parameter is optional, not required.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 ```
 
 Der Besucher kann etwas in das Eingabefeld eingeben und OK drücken. Dann erhalten wir diesen Text im `Ergebnis`. Oder er kann die Eingabe beenden, indem er Abbrechen drückt oder `key:Esc` drückt, dann erhalten wir `Null` als `Ergebnis`.
diff --git a/1-js/02-first-steps/08-operators/4-fix-prompt/solution.md b/1-js/02-first-steps/08-operators/4-fix-prompt/solution.md
index 04f73fbd0..209a0702c 100644
--- a/1-js/02-first-steps/08-operators/4-fix-prompt/solution.md
+++ b/1-js/02-first-steps/08-operators/4-fix-prompt/solution.md
@@ -9,7 +9,7 @@ let b = "2"; // prompt("Second number?", 2);
 alert(a + b); // 12
 ```
 
-What we should to is to convert strings to numbers before `+`. For example, using `Number()` or prepending them with `+`.
+What we should do is to convert strings to numbers before `+`. For example, using `Number()` or prepending them with `+`.
 
 For example, right before `prompt`:
 
diff --git a/1-js/02-first-steps/08-operators/article.md b/1-js/02-first-steps/08-operators/article.md
index 7943b0ec2..f1f583f59 100644
--- a/1-js/02-first-steps/08-operators/article.md
+++ b/1-js/02-first-steps/08-operators/article.md
@@ -180,7 +180,11 @@ Klammern überschreiben alle Prioritäten. Wenn wir mit der Standardreihenfolge
 
 In JavaScript gibt es viele Operatoren. Jeder Operator hat eine entsprechende Vorrangsnummer. Der mit der größeren Nummer wird zuerst ausgeführt. Bei gleicher Rangfolge erfolgt die Ausführung von links nach rechts.
 
+<<<<<<< HEAD
 Hier ist ein Auszug aus der [Ranglistentabelle](https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Operators/Operator_Precedence) (Du musst dir das nicht merken, aber beachte, dass unäre Operatoren höher sind als entsprechende binäre):
+=======
+Here's an extract from the [precedence table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence) (you don't need to remember this, but note that unary operators are higher than corresponding binary ones):
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 | Vorrang | Name | Zeichen |
 |------------|------|------|
@@ -428,7 +432,11 @@ Die Liste der Operatoren:
 - Rechtsverschiebung ( `>>` )
 - Null füllende Rechtsverschiebung ( `>>>` )
 
+<<<<<<< HEAD
 Diese Operatoren werden sehr selten verwendet, wenn wir mit Zahlen auf der untersten (bitweisen) Ebene herumspielen müssen. Wir werden diese Operatoren in absehbarer Zeit nicht brauchen, da die Webentwicklung kaum Gebrauch von ihnen macht, aber in einigen speziellen Bereichen, wie der Kryptographie, sind sie nützlich. Bei bedarf kannst du den Artikel [Bitweise Operatoren](https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Operators/Bitwise_Operatoren) auf MDN lesen.
+=======
+These operators are used very rarely, when we need to fiddle with numbers on the very lowest (bitwise) level. We won't need these operators any time soon, as web development has little use of them, but in some special areas, such as cryptography, they are useful. You can read the [Bitwise Operators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Bitwise) chapter on MDN when a need arises.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 ## Komma
 
diff --git a/1-js/02-first-steps/09-comparison/1-comparison-questions/solution.md b/1-js/02-first-steps/09-comparison/1-comparison-questions/solution.md
index a86a9f73e..632b1cf4e 100644
--- a/1-js/02-first-steps/09-comparison/1-comparison-questions/solution.md
+++ b/1-js/02-first-steps/09-comparison/1-comparison-questions/solution.md
@@ -14,7 +14,7 @@ Some of the reasons:
 
 1. Obviously, true.
 2. Dictionary comparison, hence false. `"a"` is smaller than `"p"`.
-3. Again, dictionary comparison, first char of `"2"` is greater than the first char of `"1"`.
+3. Again, dictionary comparison, first char `"2"` is greater than the first char `"1"`.
 4. Values `null` and `undefined` equal each other only.
 5. Strict equality is strict. Different types from both sides lead to false.
 6. Similar to `(4)`, `null` only equals `undefined`.
diff --git a/1-js/02-first-steps/09-comparison/article.md b/1-js/02-first-steps/09-comparison/article.md
index a323dc93d..ead7922ff 100644
--- a/1-js/02-first-steps/09-comparison/article.md
+++ b/1-js/02-first-steps/09-comparison/article.md
@@ -9,9 +9,9 @@ In JavaScript they are written like this:
 - Equals: `a == b`, please note the double equality sign `==` means the equality test, while a single one `a = b` means an assignment.
 - Not equals. In maths the notation is <code>&ne;</code>, but in JavaScript it's written as <code>a != b</code>.
 
-In this article we'll learn more about different types of comparisons, how JavaScript makes them, including important peculiarities. 
+In this article we'll learn more about different types of comparisons, how JavaScript makes them, including important peculiarities.
 
-At the end you'll find a good recipe to avoid "javascript quirks"-related issues.
+At the end you'll find a good recipe to avoid "JavaScript quirks"-related issues.
 
 ## Boolean is the result
 
@@ -57,7 +57,9 @@ The algorithm to compare two strings is simple:
 4. Repeat until the end of either string.
 5. If both strings end at the same length, then they are equal. Otherwise, the longer string is greater.
 
-In the examples above, the comparison `'Z' > 'A'` gets to a result at the first step while the strings `"Glow"` and `"Glee"` are compared character-by-character:
+In the first example above, the comparison `'Z' > 'A'` gets to a result at the first step.
+
+The second comparison `'Glow'` and `'Glee'` needs more steps as strings are compared character-by-character:
 
 1. `G` is the same as `G`.
 2. `l` is the same as `l`.
diff --git a/1-js/02-first-steps/10-ifelse/article.md b/1-js/02-first-steps/10-ifelse/article.md
index 30287ccba..7327243b1 100644
--- a/1-js/02-first-steps/10-ifelse/article.md
+++ b/1-js/02-first-steps/10-ifelse/article.md
@@ -1,4 +1,4 @@
-# Conditional operators: if, '?'
+# Conditional branching: if, '?'
 
 Sometimes, we need to perform different actions based on different conditions.
 
diff --git a/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md b/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md
index d692bca9f..864c1b2b7 100644
--- a/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md
+++ b/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md
@@ -4,4 +4,10 @@ importance: 3
 
 # Bereichsprüfung (positiv)
 
+<<<<<<< HEAD
 Schreibe die Bedingung für eine Fallunterscheidung mit `if` um zu prüfen, daß `age` zwischen `14` and `90` liegt (Grenzen inklusive, `age` kann also die Werte `14` und `90` annehmen).
+=======
+Write an `if` condition to check that `age` is between `14` and `90` inclusively.
+
+"Inclusively" means that `age` can reach the edges `14` or `90`.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
diff --git a/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md b/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md
index 64f3e82ca..6c3b5bf59 100644
--- a/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md
+++ b/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md
@@ -4,6 +4,10 @@ importance: 3
 
 # Bereichsprüfung (negativ)
 
+<<<<<<< HEAD
 Schreibe die Bedingung für eine Fallunterscheidung mit `if` um zu prüfen, dass `age` NICHT zwischen `14` und `90` liegt (Grenzen inklusive).
+=======
+Write an `if` condition to check that `age` is NOT between `14` and `90` inclusively.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Formuliere 2 Varianten, die Erste mit NICHT `!`, die Zweite -- ohne.
diff --git a/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md b/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md
index 3f8d2da9b..b7dfd7558 100644
--- a/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md
+++ b/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md
@@ -3,20 +3,32 @@
 ```js run demo
 let userName = prompt("Wer da?", '');
 
-if (userName == 'Admin') {
+if (userName === 'Admin') {
 
   let pass = prompt('Passwort?', '');
 
+<<<<<<< HEAD
   if (pass == 'TheMaster') {
     alert( 'Willkommen!' );
   } else if (pass == '' || pass == null) {
     alert( 'Abbruch' );
+=======
+  if (pass === 'TheMaster') {
+    alert( 'Welcome!' );
+  } else if (pass === '' || pass === null) {
+    alert( 'Canceled' );
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
   } else {
     alert( 'Falsches Passwort' );
   }
 
+<<<<<<< HEAD
 } else if (userName == '' || userName == null) {
   alert( 'Abbruch' );
+=======
+} else if (userName === '' || userName === null) {
+  alert( 'Canceled' );
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 } else {
   alert( "Ich kenne Sie nicht!" );
 }
diff --git a/1-js/02-first-steps/11-logical-operators/article.md b/1-js/02-first-steps/11-logical-operators/article.md
index 066c17610..80c114d24 100644
--- a/1-js/02-first-steps/11-logical-operators/article.md
+++ b/1-js/02-first-steps/11-logical-operators/article.md
@@ -84,7 +84,11 @@ arbeitet der Operator ODER `||` wie folgt:
 
 Ein Wert wird in seiner ursprünglichen Form zurückgegeben, ohne die Konvertierung.
 
+<<<<<<< HEAD
 Mit anderen Worten, eine Folge von ODER `"||"` gibt den ersten effektiv wahren Wert zurück oder - sofern kein solcher gefunden wird - den letzten Wert.
+=======
+In other words, a chain of OR `||` returns the first truthy value or the last one if no truthy value is found.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Beispiel:
 
@@ -101,9 +105,15 @@ Das führt im Vergleich zu einem "reinen, klassischen, nur-Booleschen ODER" zu e
 
 1. **Bestimme den ersten effektiv wahren Wert aus einer Liste von Variablen bzw. Ausdrücken.**
 
+<<<<<<< HEAD
     Haben wir zum Beispiel die Variablen `firstName`, `lastName` und `nickName`, die alle optional sind.
 
     Benutzen wir ODER `||`, um denjenigen auszuwählen, der Daten enthält und geben sie aus (oder `Anonym` wenn nichts gesetzt ist):
+=======
+    For instance, we have `firstName`, `lastName` and `nickName` variables, all optional (i.e. can be undefined or have falsy values).
+
+    Let's use OR `||` to choose the one that has the data and show it (or `"Anonymous"` if nothing set):
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
     ```js run
     let firstName = "";
@@ -115,7 +125,11 @@ Das führt im Vergleich zu einem "reinen, klassischen, nur-Booleschen ODER" zu e
     */!*
     ```
 
+<<<<<<< HEAD
     Wenn alle Variablen falsch sind, würde `Anonym` herauskommen.
+=======
+    If all variables were falsy, `"Anonymous"` would show up.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 2. **Short-circuit evaluation.**
 
@@ -223,8 +237,13 @@ Die Präzedenz der Operators UND  `&&` ist höher als die von ODER `||`.
 Der Code `a && b || c && d` verhält sich daher i.w. so, als ob die Ausdrücke mit `&&` in Klammern gesetzt würden: `(a && b) || (c && d)`.
 ````
 
+<<<<<<< HEAD
 ````warn header="Ersetze `if` nicht durch || oder &&"
 Manchmal wird der Operator UND `&&` als "Kürzel zum Schreiben von `if`" verwendet.
+=======
+````warn header="Don't replace `if` with `||` or `&&`"
+Sometimes, people use the AND `&&` operator as a "shorter way to write `if`".
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 Beispiel:
 
@@ -244,7 +263,11 @@ let x = 1;
 if (x > 0) alert( 'Größer als Null!' );
 ```
 
+<<<<<<< HEAD
 Obwohl die Variante mit `&&` kürzer erscheint, ist `if` offensichtlicher und tendenziell etwas lesbarer. Daher empfehlen wir, jedes Konstrukt für seinen Zweck zu verwenden: Verwende `if`, wenn wir eine Bedingung wollen, und verwende `&&`, wenn wir UND wollen.
+=======
+Although, the variant with `&&` appears shorter, `if` is more obvious and tends to be a little bit more readable. So we recommend using every construct for its purpose: use `if` if we want `if` and use `&&` if we want AND.
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 ````
 
 
diff --git a/1-js/02-first-steps/12-nullish-coalescing-operator/article.md b/1-js/02-first-steps/12-nullish-coalescing-operator/article.md
index f0f6687a3..55e0c2067 100644
--- a/1-js/02-first-steps/12-nullish-coalescing-operator/article.md
+++ b/1-js/02-first-steps/12-nullish-coalescing-operator/article.md
@@ -2,32 +2,57 @@
 
 [recent browser="new"]
 
-The nullish coalescing operator `??` provides a short syntax for selecting a first "defined" variable from the list.
+Here, in this article, we'll say that an expression is "defined" when it's neither `null` nor `undefined`.
+
+The nullish coalescing operator is written as two question marks `??`.
 
 The result of `a ?? b` is:
-- `a` if it's not `null` or `undefined`,
-- `b`, otherwise.
+- if `a` is defined, then `a`,
+- if `a` isn't defined, then `b`.
+
+
+In other words, `??` returns the first argument if it's not `null/undefined`. Otherwise, the second one.
 
-So, `x = a ?? b` is a short equivalent to:
+The nullish coalescing operator isn't anything completely new. It's just a nice syntax to get the first "defined" value of the two.
+
+We can rewrite `result = a ?? b` using the operators that we already know, like this:
 
 ```js
-x = (a !== null && a !== undefined) ? a : b;
+result = (a !== null && a !== undefined) ? a : b;
 ```
 
-Here's a longer example.
+The common use case for `??` is to provide a default value for a potentially undefined variable.
+
+For example, here we show `Anonymous` if `user` isn't defined:
 
-Imagine, we have a user, and there are variables `firstName`, `lastName` or `nickName` for their first name, last name and the nick name. All of them may be undefined, if the user decided not to enter any value.
+```js run
+let user;
 
-We'd like to display the user name: one of these three variables, or show "Anonymous" if nothing is set.
+alert(user ?? "Anonymous"); // Anonymous
+```
 
-Let's use the `??` operator to select the first defined one:
+Of course, if `user` had any value except `null/undefined`, then we would see it instead:
+
+```js run
+let user = "John";
+
+alert(user ?? "Anonymous"); // John
+```
+
+We can also use a sequence of `??` to select the first value from a list that isn't `null/undefined`.
+
+Let's say we have a user's data in variables `firstName`, `lastName` or `nickName`. All of them may be undefined, if the user decided not to enter a value.
+
+We'd like to display the user name using one of these variables, or show "Anonymous" if all of them are undefined.
+
+Let's use the `??` operator for that:
 
 ```js run
 let firstName = null;
 let lastName = null;
 let nickName = "Supercoder";
 
-// show the first not-null/undefined value
+// shows the first defined value:
 *!*
 alert(firstName ?? lastName ?? nickName ?? "Anonymous"); // Supercoder
 */!*
@@ -35,23 +60,34 @@ alert(firstName ?? lastName ?? nickName ?? "Anonymous"); // Supercoder
 
 ## Comparison with ||
 
-The OR `||` operator can be used in the same way as `??`. Actually, we can replace `??` with `||` in the code above and get the same result, as it was described in the [previous chapter](info:logical-operators#or-finds-the-first-truthy-value).
+The OR `||` operator can be used in the same way as `??`, as it was described in the [previous chapter](info:logical-operators#or-finds-the-first-truthy-value).
 
-The important difference is that:
-- `||` returns the first *truthy* value.
-- `??` returns the first *defined* value.
+For example, in the code above we could replace `??` with `||` and still get the same result:
 
-This matters a lot when we'd like to treat `null/undefined` differently from `0`.
-
-For example, consider this:
+```js run
+let firstName = null;
+let lastName = null;
+let nickName = "Supercoder";
 
-```js
-height = height ?? 100;
+// shows the first truthy value:
+*!*
+alert(firstName || lastName || nickName || "Anonymous"); // Supercoder
+*/!*
 ```
 
-This sets `height` to `100` if it's not defined.
+The OR `||` operator exists since the beginning of JavaScript, so developers were using it for such purposes for a long time.
+
+On the other hand, the nullish coalescing operator `??` was added to JavaScript only recently, and the reason for that was that people weren't quite happy with `||`.
+
+The important difference between them is that:
+- `||` returns the first *truthy* value.
+- `??` returns the first *defined* value.
+
+In other words, `||` doesn't distinguish between `false`, `0`, an empty string `""` and `null/undefined`. They are all the same -- falsy values. If any of these is the first argument of `||`, then we'll get the second argument as the result.
 
-Let's compare it with `||`:
+In practice though, we may want to use default value only when the variable is `null/undefined`. That is, when the value is really unknown/not set.
+
+For example, consider this:
 
 ```js run
 let height = 0;
@@ -60,19 +96,18 @@ alert(height || 100); // 100
 alert(height ?? 100); // 0
 ```
 
-Here, `height || 100` treats zero height as unset, same as `null`, `undefined` or any other falsy value. So the result is `100`.
+- The `height || 100` checks `height` for being a falsy value, and it really is.
+    - so the result is the second argument, `100`.
+- The `height ?? 100` checks `height` for being `null/undefined`, and it's not,
+    - so the result is `height` "as is", that is `0`.
 
-The `height ?? 100` returns `100` only if `height` is exactly `null` or `undefined`. So the `alert` shows the height value `0` "as is".
-
-Which behavior is better depends on a particular use case. When zero height is a valid value, then `??` is preferrable.
+If the zero height is a valid value, that shouldn't be replaced with the default, then `??` does just the right thing.
 
 ## Precedence
 
-The precedence of the `??` operator is rather low: `7` in the [MDN table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence#Table).
-
-So `??` is evaluated after most other operations, but before `=` and `?`.
+The precedence of the `??` operator is rather low: `5` in the [MDN table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence#Table). So `??` is evaluated before `=` and `?`, but after most other operations, such as `+`, `*`.
 
-If we need to choose a value with `??` in a complex expression, then consider adding parentheses:
+So if we'd like to choose a value with `??` in an expression with other operators, consider adding parentheses:
 
 ```js run
 let height = null;
@@ -84,18 +119,19 @@ let area = (height ?? 100) * (width ?? 50);
 alert(area); // 5000
 ```
 
-Otherwise, if we omit parentheses, `*` has the higher precedence than `??` and would run first.
-
-That would work be the same as:
+Otherwise, if we omit parentheses, then as `*` has the higher precedence than `??`, it would execute first, leading to incorrect results.
 
 ```js
-// probably not correct
+// without parentheses
+let area = height ?? 100 * width ?? 50;
+
+// ...works the same as this (probably not what we want):
 let area = height ?? (100 * width) ?? 50;
 ```
 
-There's also a related language-level limitation.
+### Using ?? with && or ||
 
-**Due to safety reasons, it's forbidden to use `??` together with `&&` and `||` operators.**
+Due to safety reasons, JavaScript forbids using `??` together with `&&` and `||` operators, unless the precedence is explicitly specified with parentheses.
 
 The code below triggers a syntax error:
 
@@ -103,7 +139,7 @@ The code below triggers a syntax error:
 let x = 1 && 2 ?? 3; // Syntax error
 ```
 
-The limitation is surely debatable, but it was added to the language specification with the purpose to avoid programming mistakes, as people start to switch to `??` from `||`.
+The limitation is surely debatable, but it was added to the language specification with the purpose to avoid programming mistakes, when people start to switch to `??` from `||`.
 
 Use explicit parentheses to work around it:
 
@@ -117,7 +153,7 @@ alert(x); // 2
 
 ## Summary
 
-- The nullish coalescing operator `??` provides a short way to choose a "defined" value from the list.
+- The nullish coalescing operator `??` provides a short way to choose the first "defined" value from a list.
 
     It's used to assign default values to variables:
 
@@ -126,5 +162,5 @@ alert(x); // 2
     height = height ?? 100;
     ```
 
-- The operator `??` has a very low precedence, a bit higher than `?` and `=`.
+- The operator `??` has a very low precedence, only a bit higher than `?` and `=`, so consider adding parentheses when using it in an expression.
 - It's forbidden to use it with `||` or `&&` without explicit parentheses.
diff --git a/1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md b/1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md
index 2e04a78c4..c7de5f09b 100644
--- a/1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md
+++ b/1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md
@@ -10,6 +10,6 @@ do {
 The loop `do..while` repeats while both checks are truthy:
 
 1. The check for `num <= 100` -- that is, the entered value is still not greater than `100`.
-2. The check `&& num` is false when `num` is `null` or a empty string. Then the `while` loop stops too.
+2. The check `&& num` is false when `num` is `null` or an empty string. Then the `while` loop stops too.
 
 P.S. If `num` is `null` then `num <= 100` is `true`, so without the 2nd check the loop wouldn't stop if the user clicks CANCEL. Both checks are required.
diff --git a/1-js/02-first-steps/15-function-basics/article.md b/1-js/02-first-steps/15-function-basics/article.md
index b56fbc67d..b12d0b9e7 100644
--- a/1-js/02-first-steps/15-function-basics/article.md
+++ b/1-js/02-first-steps/15-function-basics/article.md
@@ -185,7 +185,7 @@ For instance, the aforementioned function `showMessage(from, text)` can be calle
 showMessage("Ann");
 ```
 
-That's not an error. Such a call would output `"Ann: undefined"`. There's no `text`, so it's assumed that `text === undefined`.
+That's not an error. Such a call would output `"*Ann*: undefined"`. There's no `text`, so it's assumed that `text === undefined`.
 
 If we want to use a "default" `text` in this case, then we can specify it after `=`:
 
diff --git a/1-js/02-first-steps/18-javascript-specials/article.md b/1-js/02-first-steps/18-javascript-specials/article.md
index 91be0aa45..97d0457bb 100644
--- a/1-js/02-first-steps/18-javascript-specials/article.md
+++ b/1-js/02-first-steps/18-javascript-specials/article.md
@@ -144,7 +144,7 @@ Assignments
 : There is a simple assignment: `a = b` and combined ones like `a *= 2`.
 
 Bitwise
-: Bitwise operators work with 32-bit integers at the lowest, bit-level: see the [docs](mdn:/JavaScript/Reference/Operators/Bitwise_Operators) when they are needed.
+: Bitwise operators work with 32-bit integers at the lowest, bit-level: see the [docs](mdn:/JavaScript/Guide/Expressions_and_Operators#Bitwise) when they are needed.
 
 Conditional
 : The only operator with three parameters: `cond ? resultA : resultB`. If `cond` is truthy, returns `resultA`, otherwise `resultB`.
diff --git a/1-js/03-code-quality/02-coding-style/1-style-errors/solution.md b/1-js/03-code-quality/02-coding-style/1-style-errors/solution.md
index 764e36c63..4facc8b29 100644
--- a/1-js/03-code-quality/02-coding-style/1-style-errors/solution.md
+++ b/1-js/03-code-quality/02-coding-style/1-style-errors/solution.md
@@ -12,7 +12,7 @@ function pow(x,n)  // <- no space between arguments
 
 let x=prompt("x?",''), n=prompt("n?",'') // <-- technically possible,
 // but better make it 2 lines, also there's no spaces and missing ;
-if (n<0)  // <- no spaces inside (n < 0), and should be extra line above it
+if (n<=0)  // <- no spaces inside (n <= 0), and should be extra line above it
 {   // <- figure bracket on a separate line
   // below - long lines can be split into multiple lines for improved readability
   alert(`Power ${n} is not supported, please enter an integer number greater than zero`);
@@ -39,7 +39,7 @@ function pow(x, n) {
 let x = prompt("x?", "");
 let n = prompt("n?", "");
 
-if (n < 0) {
+if (n <= 0) {
   alert(`Power ${n} is not supported,
     please enter an integer number greater than zero`);
 } else {
diff --git a/1-js/03-code-quality/02-coding-style/article.md b/1-js/03-code-quality/02-coding-style/article.md
index 4cdb23808..d9a0b3be7 100644
--- a/1-js/03-code-quality/02-coding-style/article.md
+++ b/1-js/03-code-quality/02-coding-style/article.md
@@ -328,7 +328,7 @@ Here's an example of an `.eslintrc` file:
   },
   "rules": {
     "no-console": 0,
-    "indent": ["warning", 2]
+    "indent": 2
   }
 }
 ```
diff --git a/1-js/03-code-quality/04-ninja-code/article.md b/1-js/03-code-quality/04-ninja-code/article.md
index 982cc0214..96fdf4143 100644
--- a/1-js/03-code-quality/04-ninja-code/article.md
+++ b/1-js/03-code-quality/04-ninja-code/article.md
@@ -1,7 +1,7 @@
 # Ninja code
 
 
-```quote author="Confucius"
+```quote author="Confucius (Analects)"
 Learning without thought is labor lost; thought without learning is perilous.
 ```
 
@@ -104,8 +104,8 @@ A quick read of such code becomes impossible. And when there's a typo... Ummm...
 
 ## Smart synonyms
 
-```quote author="Confucius"
-The hardest thing of all is to find a black cat in a dark room, especially if there is no cat.
+```quote author="Laozi (Tao Te Ching)"
+The Tao that can be told is not the eternal Tao. The name that can be named is not the eternal name.
 ```
 
 Using *similar* names for *same* things makes life more interesting and shows your creativity to the public.
diff --git a/1-js/03-code-quality/06-polyfills/article.md b/1-js/03-code-quality/06-polyfills/article.md
index 75db49d2f..24091eb43 100644
--- a/1-js/03-code-quality/06-polyfills/article.md
+++ b/1-js/03-code-quality/06-polyfills/article.md
@@ -23,7 +23,7 @@ Actually, there are two parts in Babel:
 
 2. Second, the polyfill.
 
-    New language features may include new built-in functions and syntax constructs.
+    New language features may include not only syntax constructs, but also built-in functions.
     The transpiler rewrites the code, transforming syntax constructs into older ones. But as for new built-in functions, we need to implement them. JavaScript is a highly dynamic language, scripts may add/modify any functions, so that they behave according to the modern standard.
 
     A script that updates/adds new functions is called "polyfill". It "fills in" the gap and adds missing implementations.
diff --git a/1-js/04-object-basics/01-object/8-multiply-numeric/task.md b/1-js/04-object-basics/01-object/8-multiply-numeric/task.md
index 33eb89220..6878ca088 100644
--- a/1-js/04-object-basics/01-object/8-multiply-numeric/task.md
+++ b/1-js/04-object-basics/01-object/8-multiply-numeric/task.md
@@ -2,9 +2,9 @@ importance: 3
 
 ---
 
-# Multiply numeric properties by 2
+# Multiply numeric property values by 2
 
-Create a function `multiplyNumeric(obj)` that multiplies all numeric properties of `obj` by `2`.
+Create a function `multiplyNumeric(obj)` that multiplies all numeric property values of `obj` by `2`.
 
 For instance:
 
diff --git a/1-js/04-object-basics/01-object/article.md b/1-js/04-object-basics/01-object/article.md
index 513f2f3e3..ed8a3f4d7 100644
--- a/1-js/04-object-basics/01-object/article.md
+++ b/1-js/04-object-basics/01-object/article.md
@@ -92,30 +92,6 @@ let user = {
 ```
 That is called a "trailing" or "hanging" comma. Makes it easier to add/remove/move around properties, because all lines become alike.
 
-````smart header="Object with const can be changed"
-Please note: an object declared as `const` *can* be modified.
-
-For instance:
-
-```js run
-const user = {
-  name: "John"
-};
-
-*!*
-user.name = "Pete"; // (*)
-*/!*
-
-alert(user.name); // Pete
-```
-
-It might seem that the line `(*)` would cause an error, but no. The `const` fixes the value of `user`, but not its contents.
-
-The `const` would give an error only if we try to set `user=...` as a whole.
-
-There's another way to make constant object properties, we'll cover it later in the chapter <info:property-descriptors>.
-````
-
 ## Square brackets
 
 For multiword properties, the dot access doesn't work:
diff --git a/1-js/04-object-basics/02-object-copy/article.md b/1-js/04-object-basics/02-object-copy/article.md
index c88872232..bbaff9ca1 100644
--- a/1-js/04-object-basics/02-object-copy/article.md
+++ b/1-js/04-object-basics/02-object-copy/article.md
@@ -1,10 +1,12 @@
-# Object copying, references
+# Object references and copying
 
-One of the fundamental differences of objects vs primitives is that they are stored and copied "by reference".
+One of the fundamental differences of objects versus primitives is that objects are stored and copied "by reference", as opposed to primitive values: strings, numbers, booleans, etc -- that are always copied "as a whole value".
 
-Primitive values: strings, numbers, booleans -- are assigned/copied "as a whole value".
+That's easy to understand if we look a bit "under a cover" of what happens when we copy a value.
 
-For instance:
+Let's start with a primitive, such as a string.
+
+Here we put a copy of `message` into `phrase`:
 
 ```js
 let message = "Hello!";
@@ -15,11 +17,13 @@ As a result we have two independent variables, each one is storing the string `"
 
 ![](variable-copy-value.svg)
 
+Quite an obvious result, right?
+
 Objects are not like that.
 
-**A variable stores not the object itself, but its "address in memory", in other words "a reference" to it.**
+**A variable assigned to an object stores not the object itself, but its "address in memory", in other words "a reference" to it.**
 
-Here's the picture for the object:
+Let's look at an example of such variable:
 
 ```js
 let user = {
@@ -27,9 +31,17 @@ let user = {
 };
 ```
 
+And here's how it's actually stored in memory:
+
 ![](variable-contains-reference.svg)
 
-Here, the object is stored somewhere in memory. And the variable `user` has a "reference" to it.
+The object is stored somewhere in memory (at the right of the picture), while the `user` variable (at the left) has a "reference" to it.
+
+We may think of an object variable, such as `user`, as of a sheet of paper with the address.
+
+When we perform actions with the object, e.g. take a property `user.name`, JavaScript engine looks into that address and performs the operation on the actual object.
+
+Now here's why it's important.
 
 **When an object variable is copied -- the reference is copied, the object is not duplicated.**
 
@@ -45,6 +57,8 @@ Now we have two variables, each one with the reference to the same object:
 
 ![](variable-copy-reference.svg)
 
+As you can see, there's still one object, now with two variables that reference it.
+
 We can use any variable to access the object and modify its contents:
 
 ```js run
@@ -59,15 +73,13 @@ admin.name = 'Pete'; // changed by the "admin" reference
 alert(*!*user.name*/!*); // 'Pete', changes are seen from the "user" reference
 ```
 
-The example above demonstrates that there is only one object. As if we had a cabinet with two keys and used one of them (`admin`) to get into it. Then, if we later use another key (`user`) we can see changes.
+It's just as if we had a cabinet with two keys and used one of them (`admin`) to get into it. Then, if we later use another key (`user`) we can see changes.
 
 ## Comparison by reference
 
-The equality `==` and strict equality `===` operators for objects work exactly the same.
-
-**Two objects are equal only if they are the same object.**
+Two objects are equal only if they are the same object.
 
-Here two variables reference the same object, thus they are equal:
+For instance, here `a` and `b` reference the same object, thus they are equal:
 
 ```js run
 let a = {};
@@ -77,7 +89,7 @@ alert( a == b ); // true, both variables reference the same object
 alert( a === b ); // true
 ```
 
-And here two independent objects are not equal, even though both are empty:
+And here two independent objects are not equal, even though they look alike (both are empty):
 
 ```js run
 let a = {};
@@ -86,7 +98,7 @@ let b = {}; // two independent objects
 alert( a == b ); // false
 ```
 
-For comparisons like `obj1 > obj2` or for a comparison against a primitive `obj == 5`, objects are converted to primitives. We'll study how object conversions work very soon, but to tell the truth, such comparisons occur very rarely, usually as a result of a coding mistake.
+For comparisons like `obj1 > obj2` or for a comparison against a primitive `obj == 5`, objects are converted to primitives. We'll study how object conversions work very soon, but to tell the truth, such comparisons are needed very rarely, usually they appear as a result of a programming mistake.
 
 ## Cloning and merging, Object.assign
 
@@ -215,10 +227,32 @@ alert(clone.sizes.width); // 51, see the result from the other one
 
 To fix that, we should use the cloning loop that examines each value of `user[key]` and, if it's an object, then replicate its structure as well. That is called a "deep cloning".
 
-There's a standard algorithm for deep cloning that handles the case above and more complex cases, called the [Structured cloning algorithm](https://html.spec.whatwg.org/multipage/structured-data.html#safe-passing-of-structured-data).
-
 We can use recursion to implement it. Or, not to reinvent the wheel, take an existing implementation, for instance [_.cloneDeep(obj)](https://lodash.com/docs#cloneDeep) from the JavaScript library [lodash](https://lodash.com).
 
+```smart header="Const objects can be modified"
+An important "side effect" of storing objects as references is that an object declared as `const` *can* be modified.
+
+For instance:
+
+```js run
+const user = {
+  name: "John"
+};
+
+*!*
+user.name = "Pete"; // (*)
+*/!*
+
+alert(user.name); // Pete
+```
+
+It might seem that the line `(*)` would cause an error, but no. The value of `user` is constant, it must always reference the same object. But properties of that object are free to change.
+
+In other words, the `const user` gives an error only if we try to set `user=...` as a whole, and that's all.
+
+That said, if we really need to make constant object properties, it's also possible, but using totally different methods, we'll mention that in the chapter <info:property-descriptors>.
+```
+
 ## Summary
 
 Objects are assigned and copied by reference. In other words, a variable stores not the "object value", but a "reference" (address in memory) for the value. So copying such a variable or passing it as a function argument copies that reference, not the object.
diff --git a/1-js/04-object-basics/03-garbage-collection/article.md b/1-js/04-object-basics/03-garbage-collection/article.md
index 672e26d43..9750d33a2 100644
--- a/1-js/04-object-basics/03-garbage-collection/article.md
+++ b/1-js/04-object-basics/03-garbage-collection/article.md
@@ -23,7 +23,7 @@ Simply put, "reachable" values are those that are accessible or usable somehow.
 
 2. Any other value is considered reachable if it's reachable from a root by a reference or by a chain of references.
 
-    For instance, if there's an object in a local variable, and that object has a property referencing another object, that object is considered reachable. And those that it references are also reachable. Detailed examples to follow.
+    For instance, if there's an object in a global variable, and that object has a property referencing another object, *that* object is considered reachable. And those that it references are also reachable. Detailed examples to follow.
 
 There's a background process in the JavaScript engine that is called [garbage collector](https://en.wikipedia.org/wiki/Garbage_collection_(computer_science)). It monitors all objects and removes those that have become unreachable.
 
diff --git a/1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md b/1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md
index c1aaf4f97..f33c9310e 100644
--- a/1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md
+++ b/1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md
@@ -7,7 +7,7 @@ function makeUser() {
     name: "John",
     ref: this
   };
-};
+}
 
 let user = makeUser();
 
@@ -45,7 +45,7 @@ function makeUser() {
     }
 */!*
   };
-};
+}
 
 let user = makeUser();
 
diff --git a/1-js/04-object-basics/04-object-methods/4-object-property-this/task.md b/1-js/04-object-basics/04-object-methods/4-object-property-this/task.md
index 4784b082c..c6f8f9658 100644
--- a/1-js/04-object-basics/04-object-methods/4-object-property-this/task.md
+++ b/1-js/04-object-basics/04-object-methods/4-object-property-this/task.md
@@ -14,7 +14,7 @@ function makeUser() {
     name: "John",
     ref: this
   };
-};
+}
 
 let user = makeUser();
 
diff --git a/1-js/04-object-basics/04-object-methods/article.md b/1-js/04-object-basics/04-object-methods/article.md
index 75bd1856a..0d3c1f392 100644
--- a/1-js/04-object-basics/04-object-methods/article.md
+++ b/1-js/04-object-basics/04-object-methods/article.md
@@ -32,11 +32,11 @@ user.sayHi = function() {
 user.sayHi(); // Hello!
 ```
 
-Here we've just used a Function Expression to create the function and assign it to the property `user.sayHi` of the object.
+Here we've just used a Function Expression to create a function and assign it to the property `user.sayHi` of the object.
 
-Then we can call it. The user can now speak!
+Then we can call it as `user.sayHi()`. The user can now speak!
 
-A function that is the property of an object is called its *method*.
+A function that is a property of an object is called its *method*.
 
 So, here we've got a method `sayHi` of the object `user`.
 
@@ -160,14 +160,16 @@ let user = {
 let admin = user;
 user = null; // overwrite to make things obvious
 
-admin.sayHi(); // Whoops! inside sayHi(), the old name is used! error!
+*!*
+admin.sayHi(); // TypeError: Cannot read property 'name' of null
+*/!*
 ```
 
 If we used `this.name` instead of `user.name` inside the `alert`, then the code would work.
 
 ## "this" is not bound
 
-In JavaScript, keyword `this` behaves unlike most other programming languages. It can be used in any function.
+In JavaScript, keyword `this` behaves unlike most other programming languages. It can be used in any function, even if it's not a method of an object.
 
 There's no syntax error in the following example:
 
diff --git a/1-js/04-object-basics/07-optional-chaining/article.md b/1-js/04-object-basics/07-optional-chaining/article.md
index 974689020..97fab12eb 100644
--- a/1-js/04-object-basics/07-optional-chaining/article.md
+++ b/1-js/04-object-basics/07-optional-chaining/article.md
@@ -3,46 +3,86 @@
 
 [recent browser="new"]
 
-The optional chaining `?.` is an error-proof way to access nested object properties, even if an intermediate property doesn't exist.
+The optional chaining `?.` is a safe way to access nested object properties, even if an intermediate property doesn't exist.
 
-## The problem
+## The "non-existing property" problem
 
 If you've just started to read the tutorial and learn JavaScript, maybe the problem hasn't touched you yet, but it's quite common.
 
-For example, some of our users have addresses, but few did not provide them. Then we can't safely read `user.address.street`:
+As an example, let's say we have `user` objects that hold the information about our users. 
+
+Most of our users have addresses in `user.address` property, with the street `user.address.street`, but some did not provide them.
+
+In such case, when we attempt to get `user.address.street`, and the user happens to be without an address, we get an error:
 
 ```js run
-let user = {}; // the user happens to be without address
+let user = {}; // a user without "address" property
 
 alert(user.address.street); // Error!
 ```
 
-Or, in the web development, we'd like to get an information about an element on the page, but it may not exist:
+That's the expected result. JavaScript works like this. As `user.address` is `undefined`, an attempt to get `user.address.street` fails with an error. 
+
+In many practical cases we'd prefer to get `undefined` instead of an error here (meaning "no street").
+
+...And another example. In the web development, we can get an object that corresponds to a web page element using a special method call, such as `document.querySelector('.elem')`, and it returns `null` when there's no such element.
 
 ```js run
-// Error if the result of querySelector(...) is null
-let html = document.querySelector('.my-element').innerHTML;
+// document.querySelector('.elem') is null if there's no element
+let html = document.querySelector('.elem').innerHTML; // error if it's null
 ```
 
-Before `?.` appeared in the language, the `&&` operator was used to work around that.
+Once again, if the element doesn't exist, we'll get an error accessing `.innerHTML` of `null`. And in some cases, when the absence of the element is normal, we'd like to avoid the error and just accept `html = null` as the result.
 
-For example:
+How can we do this?
+
+The obvious solution would be to check the value using `if` or the conditional operator `?`, before accessing its property, like this:
+
+```js
+let user = {};
+
+alert(user.address ? user.address.street : undefined);
+```
+
+It works, there's no error... But it's quite inelegant. As you can see, the `"user.address"` appears twice in the code. For more deeply nested properties, that becomes a problem as more repetitions are required.
+
+E.g. let's try getting `user.address.street.name`.
+
+We need to check both `user.address` and `user.address.street`:
+
+```js
+let user = {}; // user has no address
+
+alert(user.address ? user.address.street ? user.address.street.name : null : null);
+```
+
+That's just awful, one may even have problems understanding such code. 
+
+Don't even care to, as there's a better way to write it, using the `&&` operator:
 
 ```js run
 let user = {}; // user has no address
 
-alert( user && user.address && user.address.street ); // undefined (no error)
+alert( user.address && user.address.street && user.address.street.name ); // undefined (no error)
 ```
 
-AND'ing the whole path to the property ensures that all components exist, but is cumbersome to write.
+AND'ing the whole path to the property ensures that all components exist (if not, the evaluation stops), but also isn't ideal.
+
+As you can see, property names are still duplicated in the code. E.g. in the code above, `user.address` appears three times.
+
+That's why the optional chaining `?.` was added to the language. To solve this problem once and for all!
 
 ## Optional chaining
 
-The optional chaining `?.` stops the evaluation and returns `undefined` if the part before `?.` is `undefined` or `null`.
+The optional chaining `?.` stops the evaluation if the part before `?.` is `undefined` or `null` and returns that part.
 
 **Further in this article, for brevity, we'll be saying that something "exists" if it's not `null` and not `undefined`.**
 
-Here's the safe way to access `user.address.street`:
+In other words, `value?.prop`:
+- is the same as `value.prop` if `value` exists,
+- otherwise (when `value` is `undefined/null`) it returns `undefined`.
+
+Here's the safe way to access `user.address.street` using `?.`:
 
 ```js run
 let user = {}; // user has no address
@@ -50,6 +90,8 @@ let user = {}; // user has no address
 alert( user?.address?.street ); // undefined (no error)
 ```
 
+The code is short and clean, there's no duplication at all.
+
 Reading the address with `user?.address` works even if `user` object doesn't exist:
 
 ```js run
@@ -61,16 +103,14 @@ alert( user?.address.street ); // undefined
 
 Please note: the `?.` syntax makes optional the value before it, but not any further.
 
-In the example above, `user?.` allows only `user` to be `null/undefined`.
-
-On the other hand, if `user` does exist, then it must have `user.address` property, otherwise `user?.address.street` gives an error at the second dot.
+E.g. in `user?.address.street.name` the `?.` allows `user` to be `null/undefined`, but it's all it does. Further properties are accessed in a regular way. If we want some of them to be optional, then we'll need to replace more `.` with `?.`.
 
 ```warn header="Don't overuse the optional chaining"
 We should use `?.` only where it's ok that something doesn't exist.
 
-For example, if according to our coding logic `user` object must be there, but `address` is optional, then `user.address?.street` would be better.
+For example, if according to our coding logic `user` object must exist, but `address` is optional, then we should write `user.address?.street`, but not `user?.address?.street`.
 
-So, if `user` happens to be undefined due to a mistake, we'll know about it and fix it. Otherwise, coding errors can be silenced where not appropriate, and become more difficult to debug.
+So, if `user` happens to be undefined due to a mistake, we'll see a programming error about it and fix it. Otherwise, coding errors can be silenced where not appropriate, and become more difficult to debug.
 ```
 
 ````warn header="The variable before `?.` must be declared"
@@ -80,25 +120,27 @@ If there's no variable `user` at all, then `user?.anything` triggers an error:
 // ReferenceError: user is not defined
 user?.address;
 ```
-There must be `let/const/var user`. The optional chaining works only for declared variables. 
+The variable must be declared (e.g. `let/const/var user` or as a function parameter). The optional chaining works only for declared variables.
 ````
 
 ## Short-circuiting
 
 As it was said before, the `?.` immediately stops ("short-circuits") the evaluation if the left part doesn't exist.
 
-So, if there are any further function calls or side effects, they don't occur:
+So, if there are any further function calls or side effects, they don't occur.
+
+For instance:
 
 ```js run
 let user = null;
 let x = 0;
 
-user?.sayHi(x++); // nothing happens
+user?.sayHi(x++); // no "sayHi", so the execution doesn't reach x++
 
 alert(x); // 0, value not incremented
 ```
 
-## Other cases: ?.(), ?.[]
+## Other variants: ?.(), ?.[]
 
 The optional chaining `?.` is not an operator, but a special syntax construct, that also works with functions and square brackets.
 
@@ -107,23 +149,26 @@ For example, `?.()` is used to call a function that may not exist.
 In the code below, some of our users have `admin` method, and some don't:
 
 ```js run
-let user1 = {
+let userAdmin = {
   admin() {
     alert("I am admin");
   }
-}
+};
 
-let user2 = {};
+let userGuest = {};
 
 *!*
-user1.admin?.(); // I am admin
-user2.admin?.();
+userAdmin.admin?.(); // I am admin
+*/!*
+
+*!*
+userGuest.admin?.(); // nothing (no such method)
 */!*
 ```
 
-Here, in both lines we first use the dot `.` to get `admin` property, because the user object must exist, so it's safe read from it.
+Here, in both lines we first use the dot (`user1.admin`) to get `admin` property, because the user object must exist, so it's safe read from it.
 
-Then `?.()` checks the left part: if the admin function exists, then it runs (for `user1`). Otherwise (for `user2`) the evaluation stops without errors.
+Then `?.()` checks the left part: if the admin function exists, then it runs (that's so for `user1`). Otherwise (for `user2`) the evaluation stops without errors.
 
 The `?.[]` syntax also works, if we'd like to use brackets `[]` to access properties instead of dot `.`. Similar to previous cases, it allows to safely read a property from an object that may not exist.
 
@@ -148,28 +193,30 @@ Also we can use `?.` with `delete`:
 delete user?.name; // delete user.name if user exists
 ```
 
-```warn header="We can use `?.` for safe reading and deleting, but not writing"
-The optional chaining `?.` has no use at the left side of an assignment:
+````warn header="We can use `?.` for safe reading and deleting, but not writing"
+The optional chaining `?.` has no use at the left side of an assignment.
 
+For example:
 ```js run
-// the idea of the code below is to write user.name, if user exists
+let user = null;
 
 user?.name = "John"; // Error, doesn't work
 // because it evaluates to undefined = "John"
 ```
 
+It's just not that smart.
+````
+
 ## Summary
 
-The `?.` syntax has three forms:
+The optional chaining `?.` syntax has three forms:
 
 1. `obj?.prop` -- returns `obj.prop` if `obj` exists, otherwise `undefined`.
 2. `obj?.[prop]` -- returns `obj[prop]` if `obj` exists, otherwise `undefined`.
-3. `obj?.method()` -- calls `obj.method()` if `obj` exists, otherwise returns `undefined`.
+3. `obj.method?.()` -- calls `obj.method()` if `obj.method` exists, otherwise returns `undefined`.
 
 As we can see, all of them are straightforward and simple to use. The `?.` checks the left part for `null/undefined` and allows the evaluation to proceed if it's not so.
 
 A chain of `?.` allows to safely access nested properties.
 
-Still, we should apply `?.` carefully, only where it's ok that the left part doesn't to exist.
-
-So that it won't hide programming errors from us, if they occur.
+Still, we should apply `?.` carefully, only where it's acceptable that the left part doesn't to exist. So that it won't hide programming errors from us, if they occur.
diff --git a/1-js/04-object-basics/08-symbol/article.md b/1-js/04-object-basics/08-symbol/article.md
index 1ed73ed4b..e469bb0ba 100644
--- a/1-js/04-object-basics/08-symbol/article.md
+++ b/1-js/04-object-basics/08-symbol/article.md
@@ -121,7 +121,7 @@ user.id = "Their id value"
 // Boom! overwritten by another script!
 ```
 
-### Symbols in a literal
+### Symbols in an object literal
 
 If we want to use a symbol in an object literal `{...}`, we need square brackets around it.
 
@@ -133,7 +133,7 @@ let id = Symbol("id");
 let user = {
   name: "John",
 *!*
-  [id]: 123 // not "id: 123"
+  [id]: 123 // not "id": 123
 */!*
 };
 ```
diff --git a/1-js/04-object-basics/09-object-toprimitive/article.md b/1-js/04-object-basics/09-object-toprimitive/article.md
index f6b715ce5..36b6c6460 100644
--- a/1-js/04-object-basics/09-object-toprimitive/article.md
+++ b/1-js/04-object-basics/09-object-toprimitive/article.md
@@ -46,7 +46,7 @@ There are three variants of type conversion, so-called "hints", described in the
 `"default"`
 : Occurs in rare cases when the operator is "not sure" what type to expect.
 
-    For instance, binary plus `+` can work both with strings (concatenates them) and numbers (adds them), so both strings and numbers would do. So if the a binary plus gets an object as an argument, it uses the `"default"` hint to convert it.
+    For instance, binary plus `+` can work both with strings (concatenates them) and numbers (adds them), so both strings and numbers would do. So if a binary plus gets an object as an argument, it uses the `"default"` hint to convert it.
 
     Also, if an object is compared using `==` with a string, number or a symbol, it's also unclear which conversion should be done, so the `"default"` hint is used.
 
diff --git a/1-js/05-data-types/02-number/article.md b/1-js/05-data-types/02-number/article.md
index e768f4d47..7f48a4064 100644
--- a/1-js/05-data-types/02-number/article.md
+++ b/1-js/05-data-types/02-number/article.md
@@ -406,7 +406,7 @@ A few examples:
     alert( Math.pow(2, 10) ); // 2 in power 10 = 1024
     ```
 
-There are more functions and constants in `Math` object, including trigonometry, which you can find in the [docs for the Math](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Math) object.
+There are more functions and constants in `Math` object, including trigonometry, which you can find in the [docs for the Math object](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Math).
 
 ## Summary
 
diff --git a/1-js/05-data-types/03-string/article.md b/1-js/05-data-types/03-string/article.md
index 765823d7c..c0f9f3b27 100644
--- a/1-js/05-data-types/03-string/article.md
+++ b/1-js/05-data-types/03-string/article.md
@@ -110,7 +110,7 @@ alert( 'I*!*\'*/!*m the Walrus!' ); // *!*I'm*/!* the Walrus!
 
 As you can see, we have to prepend the inner quote by the backslash `\'`, because otherwise it would indicate the string end.
 
-Of course, only to the quotes that are the same as the enclosing ones need to be escaped. So, as a more elegant solution, we could switch to double quotes or backticks instead:
+Of course, only the quotes that are the same as the enclosing ones need to be escaped. So, as a more elegant solution, we could switch to double quotes or backticks instead:
 
 ```js run
 alert( `I'm the Walrus!` ); // I'm the Walrus!
@@ -312,7 +312,7 @@ if (str.indexOf("Widget") != -1) {
 
 #### The bitwise NOT trick
 
-One of the old tricks used here is the [bitwise NOT](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_NOT) `~` operator. It converts the number to a 32-bit integer (removes the decimal part if exists) and then reverses all bits in its binary representation.
+One of the old tricks used here is the [bitwise NOT](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT) `~` operator. It converts the number to a 32-bit integer (removes the decimal part if exists) and then reverses all bits in its binary representation.
 
 In practice, that means a simple thing: for 32-bit integers `~n` equals `-(n+1)`.
 
@@ -345,7 +345,7 @@ It is usually not recommended to use language features in a non-obvious way, but
 
 Just remember: `if (~str.indexOf(...))` reads as "if found".
 
-To be precise though, as big numbers are truncated to 32 bits by `~` operator, there exist other numbers that give `0`, the smallest is `~4294967295=0`. That makes such check is correct only if a string is not that long.
+To be precise though, as big numbers are truncated to 32 bits by `~` operator, there exist other numbers that give `0`, the smallest is `~4294967295=0`. That makes such check correct only if a string is not that long.
 
 Right now we can see this trick only in the old code, as modern JavaScript provides `.includes` method (see below).
 
diff --git a/1-js/05-data-types/04-array/article.md b/1-js/05-data-types/04-array/article.md
index 33498f40a..eaa3ea006 100644
--- a/1-js/05-data-types/04-array/article.md
+++ b/1-js/05-data-types/04-array/article.md
@@ -193,7 +193,7 @@ An array is a special kind of object. The square brackets used to access a prope
 
 They extend objects providing special methods to work with ordered collections of data and also the `length` property. But at the core it's still an object.
 
-Remember, there are only 7 basic types in JavaScript. Array is an object and thus behaves like an object.
+Remember, there are only eight basic data types in JavaScript (see the [Data types](info:types) chapter for more info). Array is an object and thus behaves like an object.
 
 For instance, it is copied by reference:
 
@@ -429,6 +429,53 @@ alert( "1" + 1 ); // "11"
 alert( "1,2" + 1 ); // "1,21"
 ```
 
+## Don't compare arrays with ==
+
+Arrays in JavaScript, unlike some other programming languages, shouldn't be compared with operator `==`.
+
+This operator has no special treatment for arrays, it works with them as with any objects.
+
+Let's recall the rules:
+
+- Two objects are equal `==` only if they're references to the same object.
+- If one of arguments of `==` is an object, and the other one is a primitive, then the object gets converted to primitive, as explained in the chapter <info:object-toprimitive>.
+- ...With an exception of `null` and `undefined` that equal `==` each other and nothing else.
+
+The strict comparison `===` is even simpler, as it doesn't convert types. 
+
+So, if we compare arrays with `==`, they are never the same, unless we compare two variables that reference exactly the same array.
+
+For example:
+```js run
+alert( [] == [] ); // false
+alert( [0] == [0] ); // false
+```
+
+These arrays are technically different objects. So they aren't equal. The `==` operator doesn't do item-by-item comparison.
+
+Comparison with primitives may give seemingly strange results as well:
+
+```js run
+alert( 0 == [] ); // true
+
+alert('0' == [] ); // false
+```
+
+Here, in both cases, we compare a primitive with an array object. So the array `[]` gets converted to primitive for the purpose of comparison and becomes an empty string `''`. 
+
+Then the comparison process goes on with the primitives, as described in the chapter <info:type-conversions>:
+
+```js run
+// after [] was converted to ''
+alert( 0 == '' ); // true, as '' becomes converted to number 0
+
+alert('0' == '' ); // false, no type conversion, different strings
+```
+
+So, how to compare arrays?
+
+That's simple: don't use the `==` operator. Instead, compare them item-by-item in a loop or using iteration methods explained in the next chapter.
+
 ## Summary
 
 Array is a special kind of object, suited to storing and managing ordered data items.
@@ -460,4 +507,8 @@ To loop over the elements of the array:
   - `for (let item of arr)` -- the modern syntax for items only,
   - `for (let i in arr)` -- never use.
 
-We will return to arrays and study more methods to add, remove, extract elements and sort arrays in the chapter <info:array-methods>.
+To compare arrays, don't use the `==` operator (as well as `>`, `<` and others), as they have no special treatment for arrays. They handle them as any objects, and it's not what we usually want.
+
+Instead you can use `for..of` loop to compare arrays item-by-item.
+
+We will continue with arrays and study more methods to add, remove, extract elements and sort arrays in the next chapter <info:array-methods>.
diff --git a/1-js/05-data-types/05-array-methods/2-filter-range/task.md b/1-js/05-data-types/05-array-methods/2-filter-range/task.md
index 18b2c1d9b..46e47c93d 100644
--- a/1-js/05-data-types/05-array-methods/2-filter-range/task.md
+++ b/1-js/05-data-types/05-array-methods/2-filter-range/task.md
@@ -4,7 +4,7 @@ importance: 4
 
 # Filter range
 
-Write a function `filterRange(arr, a, b)` that gets an array `arr`, looks for elements between `a` and `b` in it and returns an array of them. 
+Write a function `filterRange(arr, a, b)` that gets an array `arr`, looks for elements with values higher or equal to `a` and lower or equal to `b` and return a result as an array.
 
 The function should not modify the array. It should return the new array.
 
diff --git a/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js b/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
index 45ef1619d..f62452a5f 100644
--- a/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
+++ b/1-js/05-data-types/05-array-methods/6-calculator-extendable/_js.view/solution.js
@@ -10,14 +10,14 @@ function Calculator() {
     let split = str.split(' '),
       a = +split[0],
       op = split[1],
-      b = +split[2]
+      b = +split[2];
 
     if (!this.methods[op] || isNaN(a) || isNaN(b)) {
       return NaN;
     }
 
     return this.methods[op](a, b);
-  }
+  };
 
   this.addMethod = function(name, func) {
     this.methods[name] = func;
diff --git a/1-js/05-data-types/05-array-methods/7-map-objects/solution.md b/1-js/05-data-types/05-array-methods/7-map-objects/solution.md
index 5d8bf4a13..2d8d4fb0e 100644
--- a/1-js/05-data-types/05-array-methods/7-map-objects/solution.md
+++ b/1-js/05-data-types/05-array-methods/7-map-objects/solution.md
@@ -25,7 +25,7 @@ alert( usersMapped[0].id ); // 1
 alert( usersMapped[0].fullName ); // John Smith
 ```
 
-Please note that in for the arrow functions we need to use additional brackets. 
+Please note that in the arrow functions we need to use additional brackets. 
 
 We can't write like this:
 ```js
diff --git a/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md b/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md
index 9f1ade707..cfaf9761a 100644
--- a/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md
+++ b/1-js/05-data-types/05-array-methods/8-sort-objects/solution.md
@@ -1,6 +1,6 @@
 ```js run no-beautify
 function sortByAge(arr) {
-  arr.sort((a, b) => a.age > b.age ? 1 : -1);
+  arr.sort((a, b) => a.age - b.age);
 }
 
 let john = { name: "John", age: 25 };
diff --git a/1-js/05-data-types/05-array-methods/article.md b/1-js/05-data-types/05-array-methods/article.md
index 301696440..bab880a27 100644
--- a/1-js/05-data-types/05-array-methods/article.md
+++ b/1-js/05-data-types/05-array-methods/article.md
@@ -36,15 +36,15 @@ That's natural, because `delete obj.key` removes a value by the `key`. It's all
 
 So, special methods should be used.
 
-The [arr.splice(start)](mdn:js/Array/splice) method is a swiss army knife for arrays. It can do everything: insert, remove and replace elements.
+The [arr.splice](mdn:js/Array/splice) method is a swiss army knife for arrays. It can do everything: insert, remove and replace elements.
 
 The syntax is:
 
 ```js
-arr.splice(index[, deleteCount, elem1, ..., elemN])
+arr.splice(start[, deleteCount, elem1, ..., elemN])
 ```
 
-It starts from the position `index`: removes `deleteCount` elements and then inserts `elem1, ..., elemN` at their place. Returns the array of removed elements.
+It modifies `arr` starting from the index `start`: removes `deleteCount` elements and then inserts `elem1, ..., elemN` at their place. Returns the array of removed elements.
 
 This method is easy to grasp by examples.
 
@@ -419,13 +419,14 @@ Now it works as intended.
 
 Let's step aside and think what's happening. The `arr` can be array of anything, right? It may contain numbers or strings or objects or whatever. We have a set of *some items*. To sort it, we need an *ordering function* that knows how to compare its elements. The default is a string order.
 
-The `arr.sort(fn)` method implements a generic sorting algorithm. We don't need to care how it internally works (an optimized [quicksort](https://en.wikipedia.org/wiki/Quicksort) most of the time). It will walk the array, compare its elements using the provided function and reorder them, all we need is to provide the `fn` which does the comparison.
+The `arr.sort(fn)` method implements a generic sorting algorithm. We don't need to care how it internally works (an optimized [quicksort](https://en.wikipedia.org/wiki/Quicksort) or [Timsort](https://en.wikipedia.org/wiki/Timsort) most of the time). It will walk the array, compare its elements using the provided function and reorder them, all we need is to provide the `fn` which does the comparison.
 
 By the way, if we ever want to know which elements are compared -- nothing prevents from alerting them:
 
 ```js run
 [1, -2, 15, 2, 0, 8].sort(function(a, b) {
   alert( a + " <> " + b );
+  return a - b;
 });
 ```
 
@@ -700,7 +701,7 @@ alert(soldiers[1].age); // 23
 
 If in the example above we used `users.filter(army.canJoin)`, then `army.canJoin` would be called as a standalone function, with `this=undefined`, thus leading to an instant error.
 
-A call to `users.filter(army.canJoin, army)` can be replaced with `users.filter(user => army.canJoin(user))`, that does the same. The former is used more often, as it's a bit easier to understand for most people.
+A call to `users.filter(army.canJoin, army)` can be replaced with `users.filter(user => army.canJoin(user))`, that does the same. The latter is used more often, as it's a bit easier to understand for most people.
 
 ## Summary
 
@@ -711,8 +712,8 @@ A cheat sheet of array methods:
   - `pop()` -- extracts an item from the end,
   - `shift()` -- extracts an item from the beginning,
   - `unshift(...items)` -- adds items to the beginning.
-  - `splice(pos, deleteCount, ...items)` -- at index `pos` delete `deleteCount` elements and insert `items`.
-  - `slice(start, end)` -- creates a new array, copies elements from position `start` till `end` (not inclusive) into it.
+  - `splice(pos, deleteCount, ...items)` -- at index `pos` deletes `deleteCount` elements and inserts `items`.
+  - `slice(start, end)` -- creates a new array, copies elements from index `start` till `end` (not inclusive) into it.
   - `concat(...items)` -- returns a new array: copies all members of the current one and adds `items` to it. If any of `items` is an array, then its elements are taken.
 
 - To search among elements:
@@ -729,7 +730,7 @@ A cheat sheet of array methods:
   - `sort(func)` -- sorts the array in-place, then returns it.
   - `reverse()` -- reverses the array in-place, then returns it.
   - `split/join` -- convert a string to array and back.
-  - `reduce(func, initial)` -- calculate a single value over the array by calling `func` for each element and passing an intermediate result between the calls.
+  - `reduce/reduceRight(func, initial)` -- calculate a single value over the array by calling `func` for each element and passing an intermediate result between the calls.
 
 - Additionally:
   - `Array.isArray(arr)` checks `arr` for being an array.
@@ -738,14 +739,27 @@ Please note that methods `sort`, `reverse` and `splice` modify the array itself.
 
 These methods are the most used ones, they cover 99% of use cases. But there are few others:
 
-- [arr.some(fn)](mdn:js/Array/some)/[arr.every(fn)](mdn:js/Array/every) checks the array.
+- [arr.some(fn)](mdn:js/Array/some)/[arr.every(fn)](mdn:js/Array/every) check the array.
 
   The function `fn` is called on each element of the array similar to `map`. If any/all results are `true`, returns `true`, otherwise `false`.
+  
+  These methods behave sort of like `||` and `&&` operators: if `fn` returns a truthy value, `arr.some()` immediately returns `true` and stops iterating over the rest items; if `fn`  returns a falsy value, `arr.every()` immediately returns `false` and stops iterating over the rest items as well.
+
+  We can use `every` to compare arrays:
+  ```js run
+  function arraysEqual(arr1, arr2) {
+    return arr1.length === arr2.length && arr1.every((value, index) => value === arr2[index]);
+  }
+
+  alert( arraysEqual([1, 2], [1, 2])); // true
+  ```
 
 - [arr.fill(value, start, end)](mdn:js/Array/fill) -- fills the array with repeating `value` from index `start` to `end`.
 
 - [arr.copyWithin(target, start, end)](mdn:js/Array/copyWithin) -- copies its elements from position `start` till position `end` into *itself*, at position `target` (overwrites existing).
 
+- [arr.flat(depth)](mdn:js/Array/flat)/[arr.flatMap(fn)](mdn:js/Array/flatMap) create a new flat array from a multidimensional array.
+
 For the full list, see the [manual](mdn:js/Array).
 
 From the first sight it may seem that there are so many methods, quite difficult to remember. But actually that's much easier.
diff --git a/1-js/05-data-types/06-iterable/article.md b/1-js/05-data-types/06-iterable/article.md
index 8a38516e1..5e464ac20 100644
--- a/1-js/05-data-types/06-iterable/article.md
+++ b/1-js/05-data-types/06-iterable/article.md
@@ -293,7 +293,7 @@ alert( str.slice(1, 3) ); // garbage (two pieces from different surrogate pairs)
 Objects that can be used in `for..of` are called *iterable*.
 
 - Technically, iterables must implement the method named `Symbol.iterator`.
-    - The result of `obj[Symbol.iterator]` is called an *iterator*. It handles the further iteration process.
+    - The result of `obj[Symbol.iterator]()` is called an *iterator*. It handles the further iteration process.
     - An iterator must have the method named `next()` that returns an object `{done: Boolean, value: any}`, here `done:true` denotes the end of the iteration process, otherwise the `value` is the next value.
 - The `Symbol.iterator` method is called automatically by `for..of`, but we also can do it directly.
 - Built-in iterables like strings or arrays, also implement `Symbol.iterator`.
@@ -304,4 +304,4 @@ Objects that have indexed properties and `length` are called *array-like*. Such
 
 If we look inside the specification -- we'll see that most built-in methods assume that they work with iterables or array-likes instead of "real" arrays, because that's more abstract.
 
-`Array.from(obj[, mapFn, thisArg])` makes a real `Array` of an iterable or array-like `obj`, and we can then use array methods on it. The optional arguments `mapFn` and `thisArg` allow us to apply a function to each item.
+`Array.from(obj[, mapFn, thisArg])` makes a real `Array` from an iterable or array-like `obj`, and we can then use array methods on it. The optional arguments `mapFn` and `thisArg` allow us to apply a function to each item.
diff --git a/1-js/05-data-types/08-weakmap-weakset/article.md b/1-js/05-data-types/08-weakmap-weakset/article.md
index bcc5e5e6f..178a4e233 100644
--- a/1-js/05-data-types/08-weakmap-weakset/article.md
+++ b/1-js/05-data-types/08-weakmap-weakset/article.md
@@ -30,7 +30,8 @@ let array = [ john ];
 john = null; // overwrite the reference
 
 *!*
-// john is stored inside the array, so it won't be garbage-collected
+// the object previously referenced by john is stored inside the array 
+// therefore it won't be garbage-collected
 // we can get it as array[0]
 */!*
 ```
diff --git a/1-js/05-data-types/11-date/1-new-date/solution.md b/1-js/05-data-types/11-date/1-new-date/solution.md
index 9bb1d749c..bed449453 100644
--- a/1-js/05-data-types/11-date/1-new-date/solution.md
+++ b/1-js/05-data-types/11-date/1-new-date/solution.md
@@ -2,7 +2,17 @@ The `new Date` constructor uses the local time zone. So the only important thing
 
 So February has number 1.
 
+Here's an example with numbers as date components:
+
+```js run
+//new Date(year, month, date, hour, minute, second, millisecond)
+let d1 = new Date(2012, 1, 20, 3, 12);
+alert( d1 );
+```
+We could also create a date from a string, like this:
+
 ```js run
-let d = new Date(2012, 1, 20, 3, 12);
-alert( d );
+//new Date(datastring)
+let d2 = new Date("February 20, 2012 03:12:00");
+alert( d2 );
 ```
diff --git a/1-js/05-data-types/11-date/article.md b/1-js/05-data-types/11-date/article.md
index a2de63ae4..2193b7cc4 100644
--- a/1-js/05-data-types/11-date/article.md
+++ b/1-js/05-data-types/11-date/article.md
@@ -69,7 +69,7 @@ To create a new `Date` object call `new Date()` with one of the following argume
     new Date(2011, 0, 1); // the same, hours etc are 0 by default
     ```
 
-    The minimal precision is 1 ms (1/1000 sec):
+    The maximal precision is 1 ms (1/1000 sec):
 
     ```js run
     let date = new Date(2011, 0, 1, 2, 3, 4, 567);
diff --git a/1-js/06-advanced-functions/01-recursion/02-factorial/solution.md b/1-js/06-advanced-functions/01-recursion/02-factorial/solution.md
index 59040a2b7..09e511db5 100644
--- a/1-js/06-advanced-functions/01-recursion/02-factorial/solution.md
+++ b/1-js/06-advanced-functions/01-recursion/02-factorial/solution.md
@@ -1,4 +1,4 @@
-By definition, a factorial is `n!` can be written as `n * (n-1)!`.
+By definition, a factorial `n!` can be written as `n * (n-1)!`.
 
 In other words, the result of `factorial(n)` can be calculated as `n` multiplied by the result of `factorial(n-1)`. And the call for `n-1` can recursively descend lower, and lower, till `1`.
 
diff --git a/1-js/06-advanced-functions/01-recursion/article.md b/1-js/06-advanced-functions/01-recursion/article.md
index 320de62f0..17fe5ea3e 100644
--- a/1-js/06-advanced-functions/01-recursion/article.md
+++ b/1-js/06-advanced-functions/01-recursion/article.md
@@ -132,7 +132,7 @@ We can sketch it as:
   </li>
 </ul>
 
-That's when the function starts to execute. The condition `n == 1` is false, so the flow continues into the second branch of `if`:
+That's when the function starts to execute. The condition `n == 1` is falsy, so the flow continues into the second branch of `if`:
 
 ```js run
 function pow(x, n) {
@@ -188,7 +188,7 @@ The new current execution context is on top (and bold), and previous remembered
 When we finish the subcall -- it is easy to resume the previous context, because it keeps both variables and the exact place of the code where it stopped.
 
 ```smart
-Here in the picture we use the word "line", as our example there's only one subcall in line, but generally a single line of code may contain multiple subcalls, like `pow(…) + pow(…) + somethingElse(…)`.
+Here in the picture we use the word "line", as in our example there's only one subcall in line, but generally a single line of code may contain multiple subcalls, like `pow(…) + pow(…) + somethingElse(…)`.
 
 So it would be more precise to say that the execution resumes "immediately after the subcall".
 ```
diff --git a/1-js/06-advanced-functions/03-closure/10-make-army/lexenv-makearmy-empty.svg b/1-js/06-advanced-functions/03-closure/10-make-army/lexenv-makearmy-empty.svg
new file mode 100644
index 000000000..c4e0e5b98
--- /dev/null
+++ b/1-js/06-advanced-functions/03-closure/10-make-army/lexenv-makearmy-empty.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/1-js/06-advanced-functions/03-closure/10-make-army/solution.md b/1-js/06-advanced-functions/03-closure/10-make-army/solution.md
index 0fb0b4a49..3dbefb521 100644
--- a/1-js/06-advanced-functions/03-closure/10-make-army/solution.md
+++ b/1-js/06-advanced-functions/03-closure/10-make-army/solution.md
@@ -1,12 +1,12 @@
 
-Let's examine what's done inside `makeArmy`, and the solution will become obvious.
+Let's examine what exactly happens inside `makeArmy`, and the solution will become obvious.
 
 1. It creates an empty array `shooters`:
 
     ```js
     let shooters = [];
     ```
-2. Fills it in the loop via `shooters.push(function...)`.
+2. Fills it with functions via `shooters.push(function)` in the loop.
 
     Every element is a function, so the resulting array looks like this:
 
@@ -26,95 +26,104 @@ Let's examine what's done inside `makeArmy`, and the solution will become obviou
     ```
 
 3. The array is returned from the function.
+    
+    Then, later, the call to any member, e.g. `army[5]()` will get the element `army[5]` from the array (which is a function) and calls it.
+    
+    Now why do all such functions show the same value, `10`?
+    
+    That's because there's no local variable `i` inside `shooter` functions. When such a function is called, it takes `i` from its outer lexical environment.
+    
+    Then, what will be the value of `i`?
+    
+    If we look at the source:
+    
+    ```js
+    function makeArmy() {
+      ...
+      let i = 0;
+      while (i < 10) {
+        let shooter = function() { // shooter function
+          alert( i ); // should show its number
+        };
+        shooters.push(shooter); // add function to the array
+        i++;
+      }
+      ...
+    }
+    ```
+    
+    We can see that all `shooter` functions are created in the lexical environment of `makeArmy()` function. But when `army[5]()` is called, `makeArmy` has already finished its job, and the final value of `i` is `10` (`while` stops at `i=10`).
+    
+    As the result, all `shooter` functions get the same value from the outer lexical environment and that is, the last value, `i=10`.
+    
+    ![](lexenv-makearmy-empty.svg)
+    
+    As you can see above, on each iteration of a `while {...}` block, a new lexical environment is created. So, to fix this, we can copy the value of `i` into a variable within the `while {...}` block, like this:
+    
+    ```js run
+    function makeArmy() {
+      let shooters = [];
+    
+      let i = 0;
+      while (i < 10) {
+        *!*
+          let j = i;
+        */!*
+          let shooter = function() { // shooter function
+            alert( *!*j*/!* ); // should show its number
+          };
+        shooters.push(shooter);
+        i++;
+      }
+    
+      return shooters;
+    }
+    
+    let army = makeArmy();
+    
+    // Now the code works correctly
+    army[0](); // 0
+    army[5](); // 5
+    ```
+    
+    Here `let j = i` declares an "iteration-local" variable `j` and copies `i` into it. Primitives are copied "by value", so we actually get an independent copy of `i`, belonging to the current loop iteration.
+    
+    The shooters work correctly, because the value of `i` now lives a little bit closer. Not in `makeArmy()` Lexical Environment, but in the Lexical Environment that corresponds the current loop iteration:
+    
+    ![](lexenv-makearmy-while-fixed.svg)
+    
+    Such problem could also be avoided if we used `for` in the beginning, like this:
+    
+    ```js run demo
+    function makeArmy() {
+    
+      let shooters = [];
+    
+    *!*
+      for(let i = 0; i < 10; i++) {
+    */!*
+        let shooter = function() { // shooter function
+          alert( i ); // should show its number
+        };
+        shooters.push(shooter);
+      }
+    
+      return shooters;
+    }
+    
+    let army = makeArmy();
+    
+    army[0](); // 0
+    army[5](); // 5
+    ```
+    
+    That's essentially the same, because `for` on each iteration generates a new lexical environment, with its own variable `i`. So `shooter` generated in every iteration references its own `i`, from that very iteration.
+    
+    ![](lexenv-makearmy-for-fixed.svg)
 
-Then, later, the call to `army[5]()` will get the element `army[5]` from the array (it will be a function) and call it.
-
-Now why all such functions show the same?
-
-That's because there's no local variable `i` inside `shooter` functions. When such a function is called, it takes `i` from its outer lexical environment.
-
-What will be the value of `i`?
-
-If we look at the source:
-
-```js
-function makeArmy() {
-  ...
-  let i = 0;
-  while (i < 10) {
-    let shooter = function() { // shooter function
-      alert( i ); // should show its number
-    };
-    ...
-  }
-  ...
-}
-```
-
-...We can see that it lives in the lexical environment associated with the current `makeArmy()` run. But when `army[5]()` is called, `makeArmy` has already finished its job, and `i` has the last value: `10` (the end of `while`).
-
-As a result, all `shooter` functions get from the outer lexical envrironment the same, last value `i=10`.
-
-We can fix it by moving the variable definition into the loop:
-
-```js run demo
-function makeArmy() {
-
-  let shooters = [];
-
-*!*
-  for(let i = 0; i < 10; i++) {
-*/!*
-    let shooter = function() { // shooter function
-      alert( i ); // should show its number
-    };
-    shooters.push(shooter);
-  }
-
-  return shooters;
-}
-
-let army = makeArmy();
-
-army[0](); // 0
-army[5](); // 5
-```
-
-Now it works correctly, because every time the code block in `for (let i=0...) {...}` is executed, a new Lexical Environment is created for it, with the corresponding variable `i`.
-
-So, the value of `i` now lives a little bit closer. Not in `makeArmy()` Lexical Environment, but in the Lexical Environment that corresponds the current loop iteration. That's why now it works.
-
-![](lexenv-makearmy.svg)
-
-Here we rewrote `while` into `for`.
-
-Another trick could be possible, let's see it for better understanding of the subject:
-
-```js run
-function makeArmy() {
-  let shooters = [];
-
-  let i = 0;
-  while (i < 10) {
-*!*
-    let j = i;
-*/!*
-    let shooter = function() { // shooter function
-      alert( *!*j*/!* ); // should show its number
-    };
-    shooters.push(shooter);
-    i++;
-  }
-
-  return shooters;
-}
-
-let army = makeArmy();
+Now, as you've put so much effort into reading this, and the final recipe is so simple - just use `for`, you may wonder -- was it worth that?
 
-army[0](); // 0
-army[5](); // 5
-```
+Well, if you could easily answer the question, you wouldn't read the solution. So, hopefully this task must have helped you to understand things a bit better. 
 
-The `while` loop, just like `for`, makes a new Lexical Environment for each run. So here we make sure that it gets the right value for a `shooter`.
+Besides, there are indeed cases when one prefers `while` to `for`, and other scenarios, where such problems are real.
 
-We copy `let j = i`. This makes a loop body local `j` and copies the value of `i` to it. Primitives are copied "by value", so we actually get a complete independent copy of `i`, belonging to the current loop iteration.
diff --git a/1-js/06-advanced-functions/03-closure/10-make-army/task.md b/1-js/06-advanced-functions/03-closure/10-make-army/task.md
index 93e64f2d0..f50c7dc20 100644
--- a/1-js/06-advanced-functions/03-closure/10-make-army/task.md
+++ b/1-js/06-advanced-functions/03-closure/10-make-army/task.md
@@ -14,22 +14,28 @@ function makeArmy() {
 
   let i = 0;
   while (i < 10) {
-    let shooter = function() { // shooter function
-      alert( i ); // should show its number
+    let shooter = function() { // create a shooter function,
+      alert( i ); // that should show its number
     };
-    shooters.push(shooter);
+    shooters.push(shooter); // and add it to the array
     i++;
   }
 
+  // ...and return the array of shooters
   return shooters;
 }
 
 let army = makeArmy();
 
-army[0](); // the shooter number 0 shows 10
-army[5](); // and number 5 also outputs 10...
-// ... all shooters show 10 instead of their 0, 1, 2, 3...
+*!*
+// all shooters show 10 instead of their numbers 0, 1, 2, 3...
+army[0](); // 10 from the shooter number 0
+army[1](); // 10 from the shooter number 1
+army[2](); // 10 ...and so on.
+*/!*
 ```
 
-Why do all of the shooters show the same value? Fix the code so that they work as intended.
+Why do all of the shooters show the same value? 
+
+Fix the code so that they work as intended.
 
diff --git a/1-js/06-advanced-functions/03-closure/7-let-scope/solution.md b/1-js/06-advanced-functions/03-closure/7-let-scope/solution.md
index 404bae80b..346e4060a 100644
--- a/1-js/06-advanced-functions/03-closure/7-let-scope/solution.md
+++ b/1-js/06-advanced-functions/03-closure/7-let-scope/solution.md
@@ -15,7 +15,7 @@ function func() {
 func();
 ```
 
-In this example we can observe the peculiar difference between a "non-existing" and "unitialized" variable.
+In this example we can observe the peculiar difference between a "non-existing" and "uninitialized" variable.
 
 As you may have read in the article [](info:closure), a variable starts in the "uninitialized" state from the moment when the execution enters a code block (or a function). And it stays uninitalized until the corresponding `let` statement.
 
diff --git a/1-js/06-advanced-functions/03-closure/article.md b/1-js/06-advanced-functions/03-closure/article.md
index 90d1d735e..3a6a7e4e5 100644
--- a/1-js/06-advanced-functions/03-closure/article.md
+++ b/1-js/06-advanced-functions/03-closure/article.md
@@ -1,11 +1,15 @@
 
-# Variable scope
+# Variable scope, closure
 
-JavaScript is a very function-oriented language. It gives us a lot of freedom. A function can be created dynamically, passed as an argument to another function and called from a totally different place of code later.
+JavaScript is a very function-oriented language. It gives us a lot of freedom. A function can be created at any moment, passed as an argument to another function, and then called from a totally different place of code later.
 
-We already know that a function can access variables outside of it.
+We already know that a function can access variables outside of it ("outer" variables).
 
-Now let's expand our knowledge to include more complex scenarios.
+But what happens if outer variables change since a function is created? Will the function get newer values or the old ones?
+
+And what if a function is passed along as a parameter and called from another place of code, will it get access to outer variables at the new place?
+
+Let's expand our knowledge to understand these scenarios and more complex ones.
 
 ```smart header="We'll talk about `let/const` variables here"
 In JavaScript, there are 3 ways to declare a variable: `let`, `const` (the modern ones), and `var` (the remnant of the past).
@@ -310,7 +314,7 @@ When on an interview, a frontend developer gets a question about "what's a closu
 
 Usually, a Lexical Environment is removed from memory with all the variables after the function call finishes. That's because there are no references to it. As any JavaScript object, it's only kept in memory while it's reachable.
 
-...But if there's a nested function that is still reachable after the end of a function, then it has `[[Environment]]` property that references the lexical environment.
+However, if there's a nested function that is still reachable after the end of a function, then it has `[[Environment]]` property that references the lexical environment.
 
 In that case the Lexical Environment is still reachable even after the completion of the function, so it stays alive.
 
@@ -329,7 +333,7 @@ let g = f(); // g.[[Environment]] stores a reference to the Lexical Environment
 // of the corresponding f() call
 ```
 
-Please note that if `f()` is called many times, and resulting functions are saved, then all corresponding Lexical Environment objects will also be retained in memory. All 3 of them in the code below:
+Please note that if `f()` is called many times, and resulting functions are saved, then all corresponding Lexical Environment objects will also be retained in memory. In the code below, all 3 of them:
 
 ```js
 function f() {
@@ -367,7 +371,7 @@ As we've seen, in theory while a function is alive, all outer variables are also
 
 But in practice, JavaScript engines try to optimize that. They analyze variable usage and if it's obvious from the code that an outer variable is not used -- it is removed.
 
-**An important side effect in V8 (Chrome, Opera) is that such variable will become unavailable in debugging.**
+**An important side effect in V8 (Chrome, Edge, Opera) is that such variable will become unavailable in debugging.**
 
 Try running the example below in Chrome with the Developer Tools open.
 
@@ -409,6 +413,6 @@ let g = f();
 g();
 ```
 
-This feature of V8 is good to know. If you are debugging with Chrome/Opera, sooner or later you will meet it.
+This feature of V8 is good to know. If you are debugging with Chrome/Edge/Opera, sooner or later you will meet it.
 
-That is not a bug in the debugger, but rather a special feature of V8. Perhaps it will be changed sometime. You always can check for it by running the examples on this page.
+That is not a bug in the debugger, but rather a special feature of V8. Perhaps it will be changed sometime. You can always check for it by running the examples on this page.
diff --git a/1-js/06-advanced-functions/04-var/article.md b/1-js/06-advanced-functions/04-var/article.md
index 1e8bb5bae..205c0a18d 100644
--- a/1-js/06-advanced-functions/04-var/article.md
+++ b/1-js/06-advanced-functions/04-var/article.md
@@ -28,7 +28,7 @@ On the other hand, it's important to understand differences when migrating old s
 
 ## "var" has no block scope
 
-Variables, declared with `var`, are either function-wide or global. They are visible through blocks.
+Variables, declared with `var`, are either function-scoped or global-scoped. They are visible through blocks.
 
 For instance:
 
@@ -60,11 +60,13 @@ The same thing for loops: `var` cannot be block- or loop-local:
 
 ```js
 for (var i = 0; i < 10; i++) {
+  var one = 1;
   // ...
 }
 
 *!*
-alert(i); // 10, "i" is visible after loop, it's a global variable
+alert(i);   // 10, "i" is visible after loop, it's a global variable
+alert(one); // 1, "one" is visible after loop, it's a global variable
 */!*
 ```
 
@@ -80,10 +82,10 @@ function sayHi() {
 }
 
 sayHi();
-alert(phrase); // Error: phrase is not defined (Check the Developer Console)
+alert(phrase); // Error: phrase is not defined
 ```
 
-As we can see, `var` pierces through `if`, `for` or other code blocks. That's because a long time ago in JavaScript blocks had no Lexical Environments. And `var` is a remnant of that.
+As we can see, `var` pierces through `if`, `for` or other code blocks. That's because a long time ago in JavaScript, blocks had no Lexical Environments, and `var` is a remnant of that.
 
 ## "var" tolerates redeclarations
 
@@ -203,11 +205,11 @@ sayHi();
 
 Because all `var` declarations are processed at the function start, we can reference them at any place. But variables are undefined until the assignments.
 
-In both examples above `alert` runs without an error, because the variable `phrase` exists. But its value is not yet assigned, so it shows `undefined`.
+In both examples above, `alert` runs without an error, because the variable `phrase` exists. But its value is not yet assigned, so it shows `undefined`.
 
-### IIFE
+## IIFE
 
-As in the past there was only `var`, and it has no block-level visibility, programmers invented a way to emulate it. What they did was called "immediately-invoked function expressions" (abbreviated as IIFE).
+In the past, as there was only `var`, and it has no block-level visibility, programmers invented a way to emulate it. What they did was called "immediately-invoked function expressions" (abbreviated as IIFE).
 
 That's not something we should use nowadays, but you can find them in old scripts.
 
@@ -216,22 +218,22 @@ An IIFE looks like this:
 ```js run
 (function() {
 
-  let message = "Hello";
+  var message = "Hello";
 
   alert(message); // Hello
 
 })();
 ```
 
-Here a Function Expression is created and immediately called. So the code executes right away and has its own private variables.
+Here, a Function Expression is created and immediately called. So the code executes right away and has its own private variables.
 
-The Function Expression is wrapped with parenthesis `(function {...})`, because when JavaScript meets `"function"` in the main code flow, it understands it as the start of a Function Declaration. But a Function Declaration must have a name, so this kind of code will give an error:
+The Function Expression is wrapped with parenthesis `(function {...})`, because when JavaScript engine encounters `"function"` in the main code, it understands it as the start of a Function Declaration. But a Function Declaration must have a name, so this kind of code will give an error:
 
 ```js run
-// Try to declare and immediately call a function
+// Tries to declare and immediately call a function
 function() { // <-- Error: Function statements require a function name
 
-  let message = "Hello";
+  var message = "Hello";
 
   alert(message); // Hello
 
@@ -277,7 +279,7 @@ In all the above cases we declare a Function Expression and run it immediately.
 
 There are two main differences of `var` compared to `let/const`:
 
-1. `var` variables have no block scope, they are visible minimum at the function level.
+1. `var` variables have no block scope, their visibility is scoped to current function, or global, if declared outside function.
 2. `var` declarations are processed at function start (script start for globals).
 
 There's one more very minor difference related to the global object, that we'll cover in the next chapter.
diff --git a/1-js/06-advanced-functions/05-global-object/article.md b/1-js/06-advanced-functions/05-global-object/article.md
index 3d195a978..ae4883c48 100644
--- a/1-js/06-advanced-functions/05-global-object/article.md
+++ b/1-js/06-advanced-functions/05-global-object/article.md
@@ -5,7 +5,7 @@ The global object provides variables and functions that are available anywhere.
 
 In a browser it is named `window`, for Node.js it is `global`, for other environments it may have another name.
 
-Recently, `globalThis` was added to the language, as a standardized name for a global object, that should be supported across all environments. In some browsers, namely non-Chromium Edge, `globalThis` is not yet supported, but can be easily polyfilled.
+Recently, `globalThis` was added to the language, as a standardized name for a global object, that should be supported across all environments. It's supported in all major browsers.
 
 We'll use `window` here, assuming that our environment is a browser. If your script may run in other environments, it's better to use `globalThis` instead.
 
@@ -25,6 +25,8 @@ var gVar = 5;
 alert(window.gVar); // 5 (became a property of the global object)
 ```
 
+The same effect have function declarations (statements with `function` keyword in the main code flow, not function expressions).
+
 Please don't rely on that! This behavior exists for compatibility reasons. Modern scripts use [JavaScript modules](info:modules) where such thing doesn't happen.
 
 If we used `let` instead, such thing wouldn't happen:
@@ -81,7 +83,7 @@ if (!window.Promise) {
     That includes JavaScript built-ins, such as `Array` and environment-specific values, such as `window.innerHeight` -- the window height in the browser.
 - The global object has a universal name `globalThis`.
 
-    ...But more often is referred by "old-school" environment-specific names, such as `window` (browser) and `global` (Node.js). As `globalThis` is a recent proposal, it's not supported in non-Chromium Edge (but can be polyfilled).
+    ...But more often is referred by "old-school" environment-specific names, such as `window` (browser) and `global` (Node.js).
 - We should store values in the global object only if they're truly global for our project. And keep their number at minimum.
 - In-browser, unless we're using [modules](info:modules), global functions and variables declared with `var` become a property of the global object.
 - To make our code future-proof and easier to understand, we should access properties of the global object directly, as `window.x`.
diff --git a/1-js/06-advanced-functions/06-function-object/article.md b/1-js/06-advanced-functions/06-function-object/article.md
index ed848c0c5..e93090290 100644
--- a/1-js/06-advanced-functions/06-function-object/article.md
+++ b/1-js/06-advanced-functions/06-function-object/article.md
@@ -347,7 +347,7 @@ If the function is declared as a Function Expression (not in the main code flow)
 
 Also, functions may carry additional properties. Many well-known JavaScript libraries make great use of this feature.
 
-They create a "main" function and attach many other "helper" functions to it. For instance, the [jQuery](https://jquery.com) library creates a function named `$`. The [lodash](https://lodash.com) library creates a function `_`, and then adds `_.clone`, `_.keyBy` and other properties to it (see the [docs](https://lodash.com/docs) when you want learn more about them). Actually, they do it to lessen their pollution of the global space, so that a single library gives only one global variable. That reduces the possibility of naming conflicts.
+They create a "main" function and attach many other "helper" functions to it. For instance, the [jQuery](https://jquery.com) library creates a function named `$`. The [lodash](https://lodash.com) library creates a function `_`, and then adds `_.clone`, `_.keyBy` and other properties to it (see the [docs](https://lodash.com/docs) when you want to learn more about them). Actually, they do it to lessen their pollution of the global space, so that a single library gives only one global variable. That reduces the possibility of naming conflicts.
 
 
 So, a function can do a useful job by itself and also carry a bunch of other functionality in properties.
diff --git a/1-js/06-advanced-functions/07-new-function/article.md b/1-js/06-advanced-functions/07-new-function/article.md
index 3214ba376..ffe264a4e 100644
--- a/1-js/06-advanced-functions/07-new-function/article.md
+++ b/1-js/06-advanced-functions/07-new-function/article.md
@@ -92,7 +92,7 @@ What if it could access the outer variables?
 
 The problem is that before JavaScript is published to production, it's compressed using a *minifier* -- a special program that shrinks code by removing extra comments, spaces and -- what's important, renames local variables into shorter ones.
 
-For instance, if a function has `let userName`, minifier replaces it `let a` (or another letter if this one is occupied), and does it everywhere. That's usually a safe thing to do, because the variable is local, nothing outside the function can access it. And inside the function, minifier replaces every mention of it. Minifiers are smart, they analyze the code structure, so they don't break anything. They're not just a dumb find-and-replace.
+For instance, if a function has `let userName`, minifier replaces it with `let a` (or another letter if this one is occupied), and does it everywhere. That's usually a safe thing to do, because the variable is local, nothing outside the function can access it. And inside the function, minifier replaces every mention of it. Minifiers are smart, they analyze the code structure, so they don't break anything. They're not just a dumb find-and-replace.
 
 So if `new Function` had access to outer variables, it would be unable to find renamed  `userName`.
 
diff --git a/1-js/06-advanced-functions/08-settimeout-setinterval/article.md b/1-js/06-advanced-functions/08-settimeout-setinterval/article.md
index 95fddea65..984102687 100644
--- a/1-js/06-advanced-functions/08-settimeout-setinterval/article.md
+++ b/1-js/06-advanced-functions/08-settimeout-setinterval/article.md
@@ -129,7 +129,7 @@ setTimeout(() => { clearInterval(timerId); alert('stop'); }, 5000);
 ```smart header="Time goes on while `alert` is shown"
 In most browsers, including Chrome and Firefox the internal timer continues "ticking" while showing `alert/confirm/prompt`.
 
-So if you run the code above and don't dismiss the `alert` window for some time, then in the next `alert` will be shown immediately as you do it. The actual interval between alerts will be shorter than 2 seconds.
+So if you run the code above and don't dismiss the `alert` window for some time, then the next `alert` will be shown immediately as you do it. The actual interval between alerts will be shorter than 2 seconds.
 ```
 
 ## Nested setTimeout
@@ -281,7 +281,7 @@ The similar thing happens if we use `setInterval` instead of `setTimeout`: `setI
 
 That limitation comes from ancient times and many scripts rely on it, so it exists for historical reasons.
 
-For server-side JavaScript, that limitation does not exist, and there exist other ways to schedule an immediate asynchronous job, like [setImmediate](https://nodejs.org/api/timers.html) for Node.js. So this note is browser-specific.
+For server-side JavaScript, that limitation does not exist, and there exist other ways to schedule an immediate asynchronous job, like [setImmediate](https://nodejs.org/api/timers.html#timers_setimmediate_callback_args) for Node.js. So this note is browser-specific.
 ````
 
 ## Summary
@@ -290,7 +290,7 @@ For server-side JavaScript, that limitation does not exist, and there exist othe
 - To cancel the execution, we should call `clearTimeout/clearInterval` with the value returned by `setTimeout/setInterval`.
 - Nested `setTimeout` calls are a more flexible alternative to `setInterval`, allowing us to set the time *between* executions more precisely.
 - Zero delay scheduling with `setTimeout(func, 0)` (the same as `setTimeout(func)`) is used to schedule the call "as soon as possible, but after the current script is complete".
-- The browser limits the minimal delay for five or more nested call of `setTimeout` or for `setInterval` (after 5th call) to 4ms. That's for historical reasons.
+- The browser limits the minimal delay for five or more nested calls of `setTimeout` or for `setInterval` (after 5th call) to 4ms. That's for historical reasons.
 
 Please note that all scheduling methods do not *guarantee* the exact delay.
 
diff --git a/1-js/06-advanced-functions/09-call-apply-decorators/03-debounce/task.md b/1-js/06-advanced-functions/09-call-apply-decorators/03-debounce/task.md
index 550bf52da..347a5e64f 100644
--- a/1-js/06-advanced-functions/09-call-apply-decorators/03-debounce/task.md
+++ b/1-js/06-advanced-functions/09-call-apply-decorators/03-debounce/task.md
@@ -6,6 +6,8 @@ importance: 5
 
 The result of `debounce(f, ms)` decorator is a wrapper that suspends calls to `f` until there's `ms` milliseconds of inactivity (no calls, "cooldown period"), then invokes `f` once with the latest arguments.
 
+In other words, `debounce` is like a secretary that accepts "phone calls", and waits until there's `ms` milliseconds of being quiet. And only then it transfers the latest call information to "the boss" (calls the actual `f`).
+
 For instance, we had a function `f` and replaced it with `f = debounce(f, 1000)`.
 
 Then if the wrapped function is called at 0ms, 200ms and 500ms, and then there are no calls, then the actual `f` will be only called once, at 1500ms. That is: after the cooldown period of 1000ms from the last call.
@@ -14,7 +16,7 @@ Then if the wrapped function is called at 0ms, 200ms and 500ms, and then there a
 
 ...And it will get the arguments of the very last call, other calls are ignored.
 
-Here's the code for it (uses the debounce decorator from the [Lodash library](https://lodash.com/docs/4.17.15#debounce):
+Here's the code for it (uses the debounce decorator from the [Lodash library](https://lodash.com/docs/4.17.15#debounce)):
 
 ```js
 let f = _.debounce(alert, 1000);
@@ -25,7 +27,6 @@ setTimeout( () => f("c"), 500);
 // debounced function waits 1000ms after the last call and then runs: alert("c")
 ```
 
-
 Now a practical example. Let's say, the user types something, and we'd like to send a request to the server when the input is finished.
 
 There's no point in sending the request for every character typed. Instead we'd like to wait, and then process the whole result.
@@ -43,9 +44,8 @@ See? The second input calls the debounced function, so its content is processed
 
 So, `debounce` is a great way to process a sequence of events: be it a sequence of key presses, mouse movements or something else.
 
-
 It waits the given time after the last call, and then runs its function, that can process the result.
 
 The task is to implement `debounce` decorator.
 
-Hint: that's just a few lines if you think about it :)
\ No newline at end of file
+Hint: that's just a few lines if you think about it :)
diff --git a/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/task.md b/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/task.md
index 6cb664fdb..6df7af132 100644
--- a/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/task.md
+++ b/1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/task.md
@@ -6,12 +6,14 @@ importance: 5
 
 Create a "throttling" decorator `throttle(f, ms)` -- that returns a wrapper.
 
-When it's called multiple times, it passes the call to `f` at maximum once per `ms` milliseconds. 
+When it's called multiple times, it passes the call to `f` at maximum once per `ms` milliseconds.
 
 The difference with debounce is that it's completely different decorator:
 - `debounce` runs the function once after the "cooldown" period. Good for processing the final result.
 - `throttle` runs it not more often than given `ms` time. Good for regular updates that shouldn't be very often.
 
+In other words, `throttle` is like a secretary that accepts phone calls, but bothers the boss (calls the actual `f`) not more often than once per `ms` milliseconds.
+
 Let's check the real-life application to better understand that requirement and to see where it comes from.
 
 **For instance, we want to track mouse movements.**
diff --git a/1-js/06-advanced-functions/10-bind/article.md b/1-js/06-advanced-functions/10-bind/article.md
index 787c7d68e..8de8e6fd1 100644
--- a/1-js/06-advanced-functions/10-bind/article.md
+++ b/1-js/06-advanced-functions/10-bind/article.md
@@ -167,7 +167,7 @@ sayHi(); // Hello, John!
 setTimeout(sayHi, 1000); // Hello, John!
 
 // even if the value of user changes within 1 second
-// sayHi uses the pre-bound value
+// sayHi uses the pre-bound value which is reference to the old user object
 user = {
   sayHi() { alert("Another user in setTimeout!"); }
 };
@@ -202,7 +202,7 @@ for (let key in user) {
 }
 ```
 
-JavaScript libraries also provide functions for convenient mass binding , e.g. [_.bindAll(obj)](http://lodash.com/docs#bindAll) in lodash.
+JavaScript libraries also provide functions for convenient mass binding , e.g. [_.bindAll(object, methodNames)](http://lodash.com/docs#bindAll) in lodash.
 ````
 
 ## Partial functions
diff --git a/1-js/07-object-properties/01-property-descriptors/article.md b/1-js/07-object-properties/01-property-descriptors/article.md
index 3593bffae..f8f8d21d4 100644
--- a/1-js/07-object-properties/01-property-descriptors/article.md
+++ b/1-js/07-object-properties/01-property-descriptors/article.md
@@ -227,32 +227,42 @@ To be precise, non-configurability imposes several restrictions on `defineProper
 3. Can't change `writable: false` to `true` (the other way round works).
 4. Can't change `get/set` for an accessor property (but can assign them if absent).
 
-Here we are making `user.name` a "forever sealed" constant:
+**The idea of "configurable: false" is to prevent changes of property flags and its deletion, while allowing to change its value.**
+
+Here `user.name` is non-configurable, but we can still change it (as it's writable):
 
 ```js run
-let user = { };
+let user = {
+  name: "John"
+};
+
+Object.defineProperty(user, "name", {
+  configurable: false
+});
+
+user.name = "Pete"; // works fine
+delete user.name; // Error
+```
+
+And here we make `user.name` a "forever sealed" constant:
+
+```js run
+let user = {
+  name: "John"
+};
 
 Object.defineProperty(user, "name", {
-  value: "John",
   writable: false,
   configurable: false
 });
 
-*!*
 // won't be able to change user.name or its flags
 // all this won't work:
-//   user.name = "Pete"
-//   delete user.name
-//   defineProperty(user, "name", { value: "Pete" })
-Object.defineProperty(user, "name", {writable: true}); // Error
-*/!*
+user.name = "Pete";
+delete user.name;
+Object.defineProperty(user, "name", { value: "Pete" });
 ```
 
-```smart header="\"Non-configurable\" doesn't mean \"non-writable\""
-Notable exception: a value of non-configurable, but writable property can be changed.
-
-The idea of `configurable: false` is to prevent changes to property flags and its deletion, not changes to its value.
-```
 
 ## Object.defineProperties
 
diff --git a/1-js/08-prototypes/01-prototype-inheritance/article.md b/1-js/08-prototypes/01-prototype-inheritance/article.md
index 710390f15..cd4b94d32 100644
--- a/1-js/08-prototypes/01-prototype-inheritance/article.md
+++ b/1-js/08-prototypes/01-prototype-inheritance/article.md
@@ -12,7 +12,7 @@ In JavaScript, objects have a special hidden property `[[Prototype]]` (as named
 
 ![prototype](object-prototype-empty.svg)
 
-The prototype is a little bit "magical". When we want to read a property from `object`, and it's missing, JavaScript automatically takes it from the prototype. In programming, such thing is called "prototypal inheritance". Many cool language features and programming techniques are based on it.
+When we  read a property from `object`, and it's missing, JavaScript automatically takes it from the prototype. In programming, such thing is called "prototypal inheritance". And soon we'll study many examples of such inheritance, as well as cooler language features built upon it.
 
 The property `[[Prototype]]` is internal and hidden, but there are many ways to set it.
 
@@ -27,19 +27,11 @@ let rabbit = {
 };
 
 *!*
-rabbit.__proto__ = animal;
+rabbit.__proto__ = animal; // sets rabbit.[[Prototype]] = animal
 */!*
 ```
 
-```smart header="`__proto__` is a historical getter/setter for `[[Prototype]]`"
-Please note that `__proto__` is *not the same* as `[[Prototype]]`. It's a getter/setter for it.
-
-It exists for historical reasons. In modern language it is replaced with functions `Object.getPrototypeOf/Object.setPrototypeOf` that also get/set the prototype. We'll study the reasons for that and these functions later.
-
-By the specification, `__proto__` must only be supported by browsers, but in fact all environments including server-side support it. For now, as `__proto__` notation is a little bit more intuitively obvious, we'll use it in the examples.
-```
-
-If we look for a property in `rabbit`, and it's missing, JavaScript automatically takes it from `animal`.
+Now if we read a property from `rabbit`, and it's missing, JavaScript will automatically take it from `animal`.
 
 For instance:
 
@@ -130,6 +122,8 @@ alert(longEar.jumps); // true (from rabbit)
 
 ![](proto-animal-rabbit-chain.svg)
 
+Now if we read something from `longEar`, and it's missing, JavaScript will look for it in `rabbit`, and then in `animal`.
+
 There are only two limitations:
 
 1. The references can't go in circles. JavaScript will throw an error if we try to assign `__proto__` in a circle.
@@ -137,6 +131,19 @@ There are only two limitations:
 
 Also it may be obvious, but still: there can be only one `[[Prototype]]`. An object may not inherit from two others.
 
+
+```smart header="`__proto__` is a historical getter/setter for `[[Prototype]]`"
+It's a common mistake of novice developers not to know the difference between these two. 
+
+Please note that `__proto__` is *not the same* as the internal `[[Prototype]]` property. It's a getter/setter for `[[Prototype]]`. Later we'll see situations where it matters,  for now let's just keep it in mind, as we build our understanding of JavaScript language.
+
+The `__proto__` property is a bit outdated. It exists for historical reasons, modern JavaScript suggests that we should use `Object.getPrototypeOf/Object.setPrototypeOf` functions instead that get/set the prototype. We'll also cover these functions later. 
+
+By the specification, `__proto__` must only be supported by browsers. In fact though, all environments including server-side support `__proto__`, so we're quite safe using it.
+
+As the `__proto__` notation is a bit more intuitively obvious, we use it in the examples.
+```
+
 ## Writing doesn't use prototype
 
 The prototype is only used for reading properties.
@@ -197,6 +204,9 @@ alert(admin.fullName); // John Smith (*)
 
 // setter triggers!
 admin.fullName = "Alice Cooper"; // (**)
+
+alert(admin.fullName); // Alice Cooper, state of admin modified
+alert(user.fullName); // John Smith, state of user protected
 ```
 
 Here in the line `(*)` the property `admin.fullName` has a getter in the prototype `user`, so it is called. And in the line `(**)` the property has a setter in the prototype, so it is called.
diff --git a/1-js/08-prototypes/03-native-prototypes/article.md b/1-js/08-prototypes/03-native-prototypes/article.md
index 378936c9a..6cf7aebb4 100644
--- a/1-js/08-prototypes/03-native-prototypes/article.md
+++ b/1-js/08-prototypes/03-native-prototypes/article.md
@@ -33,7 +33,9 @@ We can check it like this:
 let obj = {};
 
 alert(obj.__proto__ === Object.prototype); // true
-// obj.toString === obj.__proto__.toString == Object.prototype.toString
+
+alert(obj.toString === obj.__proto__.toString); //true
+alert(obj.toString === Object.prototype.toString); //true
 ```
 
 Please note that there is no more `[[Prototype]]` in the chain above `Object.prototype`:
diff --git a/1-js/08-prototypes/04-prototype-methods/article.md b/1-js/08-prototypes/04-prototype-methods/article.md
index d517e1564..a4ce2646c 100644
--- a/1-js/08-prototypes/04-prototype-methods/article.md
+++ b/1-js/08-prototypes/04-prototype-methods/article.md
@@ -7,7 +7,7 @@ The `__proto__` is considered outdated and somewhat deprecated (in browser-only
 
 The modern methods are:
 
-- [Object.create(proto[, descriptors])](mdn:js/Object/create) -- creates an empty object with given `proto` as `[[Prototype]]` and optional property descriptors.
+- [Object.create(proto, [descriptors])](mdn:js/Object/create) -- creates an empty object with given `proto` as `[[Prototype]]` and optional property descriptors.
 - [Object.getPrototypeOf(obj)](mdn:js/Object/getPrototypeOf) -- returns the `[[Prototype]]` of `obj`.
 - [Object.setPrototypeOf(obj, proto)](mdn:js/Object/setPrototypeOf) -- sets the `[[Prototype]]` of `obj` to `proto`.
 
@@ -175,9 +175,9 @@ alert(Object.keys(chineseDictionary)); // hello,bye
 
 Modern methods to set up and directly access the prototype are:
 
-- [Object.create(proto[, descriptors])](mdn:js/Object/create) -- creates an empty object with a given `proto` as `[[Prototype]]` (can be `null`) and optional property descriptors.
-- [Object.getPrototypeOf(obj)](mdn:js/Object.getPrototypeOf) -- returns the `[[Prototype]]` of `obj` (same as `__proto__` getter).
-- [Object.setPrototypeOf(obj, proto)](mdn:js/Object.setPrototypeOf) -- sets the `[[Prototype]]` of `obj` to `proto` (same as `__proto__` setter).
+- [Object.create(proto, [descriptors])](mdn:js/Object/create) -- creates an empty object with a given `proto` as `[[Prototype]]` (can be `null`) and optional property descriptors.
+- [Object.getPrototypeOf(obj)](mdn:js/Object/getPrototypeOf) -- returns the `[[Prototype]]` of `obj` (same as `__proto__` getter).
+- [Object.setPrototypeOf(obj, proto)](mdn:js/Object/setPrototypeOf) -- sets the `[[Prototype]]` of `obj` to `proto` (same as `__proto__` setter).
 
 The built-in `__proto__` getter/setter is unsafe if we'd want to put user-generated keys into an object. Just because a user may enter `"__proto__"` as the key, and there'll be an error, with hopefully light, but generally unpredictable consequences.
 
diff --git a/1-js/09-classes/01-class/1-rewrite-to-class/task.md b/1-js/09-classes/01-class/1-rewrite-to-class/task.md
index 05365e410..4477de679 100644
--- a/1-js/09-classes/01-class/1-rewrite-to-class/task.md
+++ b/1-js/09-classes/01-class/1-rewrite-to-class/task.md
@@ -4,6 +4,6 @@ importance: 5
 
 # Rewrite to class
 
-The `Clock` class is written in functional style. Rewrite it the "class" syntax.
+The `Clock` class (see the sandbox) is written in functional style. Rewrite it in the "class" syntax.
 
 P.S. The clock ticks in the console, open it to see.
diff --git a/1-js/09-classes/01-class/article.md b/1-js/09-classes/01-class/article.md
index 49a891b71..13686acdf 100644
--- a/1-js/09-classes/01-class/article.md
+++ b/1-js/09-classes/01-class/article.md
@@ -218,7 +218,7 @@ function makeClass(phrase) {
   return class {
     sayHi() {
       alert(phrase);
-    };
+    }
   };
 }
 
diff --git a/1-js/09-classes/02-class-inheritance/article.md b/1-js/09-classes/02-class-inheritance/article.md
index 3ce6d2995..d84ab4425 100644
--- a/1-js/09-classes/02-class-inheritance/article.md
+++ b/1-js/09-classes/02-class-inheritance/article.md
@@ -76,8 +76,8 @@ For instance, a function call that generates the parent class:
 ```js run
 function f(phrase) {
   return class {
-    sayHi() { alert(phrase) }
-  }
+    sayHi() { alert(phrase); }
+  };
 }
 
 *!*
@@ -300,7 +300,7 @@ Consider this example:
 
 ```js run
 class Animal {
-  name = 'animal'
+  name = 'animal';
 
   constructor() {
     alert(this.name); // (*)
@@ -364,7 +364,7 @@ Why is there the difference?
 
 Well, the reason is in the field initialization order. The class field is initialized:
 - Before constructor for the base class (that doesn't extend anything),
-- Imediately after `super()` for the derived class.
+- Immediately after `super()` for the derived class.
 
 In our case, `Rabbit` is the derived class. There's no `constructor()` in it. As said previously, that's the same as if there was an empty constructor with only `super(...args)`.
 
@@ -545,7 +545,7 @@ Here's the demo of a wrong `super` result after copying:
 ```js run
 let animal = {
   sayHi() {
-    console.log(`I'm an animal`);
+    alert(`I'm an animal`);
   }
 };
 
@@ -559,7 +559,7 @@ let rabbit = {
 
 let plant = {
   sayHi() {
-    console.log("I'm a plant");
+    alert("I'm a plant");
   }
 };
 
diff --git a/1-js/09-classes/06-instanceof/article.md b/1-js/09-classes/06-instanceof/article.md
index aa973da06..630818188 100644
--- a/1-js/09-classes/06-instanceof/article.md
+++ b/1-js/09-classes/06-instanceof/article.md
@@ -2,7 +2,7 @@
 
 The `instanceof` operator allows to check whether an object belongs to a certain class. It also takes inheritance into account.
 
-Such a check may be necessary in many cases. Here we'll use it for building a *polymorphic* function, the one that treats arguments differently depending on their type.
+Such a check may be necessary in many cases. For example, it can be used for building a *polymorphic* function, the one that treats arguments differently depending on their type.
 
 ## The instanceof operator [#ref-instanceof]
 
@@ -190,7 +190,7 @@ For most environment-specific objects, there is such a property. Here are some b
 
 ```js run
 // toStringTag for the environment-specific object and class:
-alert( window[Symbol.toStringTag]); // window
+alert( window[Symbol.toStringTag]); // Window
 alert( XMLHttpRequest.prototype[Symbol.toStringTag] ); // XMLHttpRequest
 
 alert( {}.toString.call(window) ); // [object Window]
diff --git a/1-js/09-classes/07-mixins/article.md b/1-js/09-classes/07-mixins/article.md
index 60f6f7c4a..d43b96c96 100644
--- a/1-js/09-classes/07-mixins/article.md
+++ b/1-js/09-classes/07-mixins/article.md
@@ -154,7 +154,7 @@ let eventMixin = {
    *  this.trigger('select', data1, data2);
    */
   trigger(eventName, ...args) {
-    if (!this._eventHandlers || !this._eventHandlers[eventName]) {
+    if (!this._eventHandlers?.[eventName]) {
       return; // no handlers for that event name
     }
 
diff --git a/1-js/10-error-handling/1-try-catch/article.md b/1-js/10-error-handling/1-try-catch/article.md
index 7d41b71b1..3a2dc4ed4 100644
--- a/1-js/10-error-handling/1-try-catch/article.md
+++ b/1-js/10-error-handling/1-try-catch/article.md
@@ -363,7 +363,7 @@ The "rethrowing" technique can be explained in more detail as:
 
 1. Catch gets all errors.
 2. In the `catch(err) {...}` block we analyze the error object `err`.
-2. If we don't know how to handle it, we do `throw err`.
+3. If we don't know how to handle it, we do `throw err`.
 
 Usually, we can check the error type using the `instanceof` operator:
 
diff --git a/1-js/11-async/01-callbacks/article.md b/1-js/11-async/01-callbacks/article.md
index 9d1a260d5..344d92b74 100644
--- a/1-js/11-async/01-callbacks/article.md
+++ b/1-js/11-async/01-callbacks/article.md
@@ -146,7 +146,7 @@ loadScript('/my/script.js', function(script) {
     });
 */!*
 
-  })
+  });
 
 });
 ```
@@ -223,7 +223,7 @@ loadScript('1.js', function(error, script) {
         });
 
       }
-    })
+    });
   }
 });
 ```
@@ -256,7 +256,7 @@ loadScript('1.js', function(error, script) {
           }
         });
       }
-    })
+    });
   }
 });
 -->
@@ -296,7 +296,7 @@ function step3(error, script) {
   } else {
     // ...continue after all scripts are loaded (*)
   }
-};
+}
 ```
 
 See? It does the same, and there's no deep nesting now because we made every action a separate top-level function.
diff --git a/1-js/11-async/02-promise-basics/article.md b/1-js/11-async/02-promise-basics/article.md
index 8909df9b5..cbec7c46b 100644
--- a/1-js/11-async/02-promise-basics/article.md
+++ b/1-js/11-async/02-promise-basics/article.md
@@ -229,11 +229,12 @@ new Promise((resolve, reject) => {
 *!*
   // runs when the promise is settled, doesn't matter successfully or not
   .finally(() => stop loading indicator)
+  // so the loading indicator is always stopped before we process the result/error
 */!*
   .then(result => show result, err => show error)
 ```
 
-It's not exactly an alias of `then(f,f)` though. There are several important differences:
+That said, `finally(f)` isn't exactly an alias of `then(f,f)` though. There are few subtle differences:
 
 1. A `finally` handler has no arguments. In `finally` we don't know whether the promise is successful or not. That's all right, as our task is usually to perform "general" finalizing procedures.
 2. A `finally` handler passes through results and errors to the next handler.
@@ -257,14 +258,13 @@ It's not exactly an alias of `then(f,f)` though. There are several important dif
       .catch(err => alert(err));  // <-- .catch handles the error object
     ```
 
-    That's very convenient, because `finally` is not meant to process a promise result. So it passes it through.
+That's very convenient, because `finally` is not meant to process a promise result. So it passes it through.
 
-    We'll talk more about promise chaining and result-passing between handlers in the next chapter.
+We'll talk more about promise chaining and result-passing between handlers in the next chapter.
 
-3. Last, but not least, `.finally(f)` is a more convenient syntax than `.then(f, f)`: no need to duplicate the function `f`.
 
-````smart header="On settled promises handlers run immediately"
-If a promise is pending, `.then/catch/finally` handlers wait for it. Otherwise, if a promise has already settled, they execute immediately:
+````smart header="We can attach handlers to settled promises"
+If a promise is pending, `.then/catch/finally` handlers wait for it. Otherwise, if a promise has already settled, they just run:
 
 ```js run
 // the promise becomes resolved immediately upon creation
@@ -273,9 +273,9 @@ let promise = new Promise(resolve => resolve("done!"));
 promise.then(alert); // done! (shows up right now)
 ```
 
-Note that this is different, and more powerful than the real life "subscription list" scenario. If the singer has already released their song and then a person signs up on the subscription list, they probably won't receive that song. Subscriptions in real life must be done prior to the event.
+Note that this makes promises more powerful than the real life "subscription list" scenario. If the singer has already released their song and then a person signs up on the subscription list, they probably won't receive that song. Subscriptions in real life must be done prior to the event.
 
-Promises are more flexible. We can add handlers any time: if the result is already there, our handlers get it immediately.
+Promises are more flexible. We can add handlers any time: if the result is already there, they just execute.
 ````
 
 Next, let's see more practical examples of how promises can help us write asynchronous code.
diff --git a/1-js/11-async/03-promise-chaining/article.md b/1-js/11-async/03-promise-chaining/article.md
index 9f3b60f3a..78d381a94 100644
--- a/1-js/11-async/03-promise-chaining/article.md
+++ b/1-js/11-async/03-promise-chaining/article.md
@@ -265,7 +265,7 @@ fetch('/article/promise-chaining/user.json')
 
 Now let's do something with the loaded user.
 
-For instance, we can make one more requests to GitHub, load the user profile and show the avatar:
+For instance, we can make one more request to GitHub, load the user profile and show the avatar:
 
 ```js run
 // Make a request for user.json
diff --git a/1-js/11-async/04-promise-error-handling/article.md b/1-js/11-async/04-promise-error-handling/article.md
index 7c6af6a33..9f7159af9 100644
--- a/1-js/11-async/04-promise-error-handling/article.md
+++ b/1-js/11-async/04-promise-error-handling/article.md
@@ -122,7 +122,7 @@ Here the `.catch` block finishes normally. So the next successful `.then` handle
 In the example below we see the other situation with `.catch`. The handler `(*)` catches the error and just can't handle it (e.g. it only knows how to handle `URIError`), so it throws it again:
 
 ```js run
-// the execution: catch -> catch -> then
+// the execution: catch -> catch
 new Promise((resolve, reject) => {
 
   throw new Error("Whoops!");
diff --git a/1-js/11-async/05-promise-api/article.md b/1-js/11-async/05-promise-api/article.md
index 191f6ed21..5b4930bee 100644
--- a/1-js/11-async/05-promise-api/article.md
+++ b/1-js/11-async/05-promise-api/article.md
@@ -176,15 +176,14 @@ So for each promise we get its status and `value/error`.
 If the browser doesn't support `Promise.allSettled`, it's easy to polyfill:
 
 ```js
-if(!Promise.allSettled) {
-  Promise.allSettled = function(promises) {
-    return Promise.all(promises.map(p => Promise.resolve(p).then(value => ({
-      status: 'fulfilled',
-      value
-    }), reason => ({
-      status: 'rejected',
-      reason
-    }))));
+if (!Promise.allSettled) {
+  const rejectHandler = reason => ({ status: 'rejected', reason });
+
+  const resolveHandler = value => ({ status: 'fulfilled', value });
+
+  Promise.allSettled = function (promises) {
+    const convertedPromises = promises.map(p => Promise.resolve(p).then(resolveHandler, rejectHandler));
+    return Promise.all(convertedPromises);
   };
 }
 ```
diff --git a/1-js/11-async/06-promisify/article.md b/1-js/11-async/06-promisify/article.md
index 4ef622546..ac9499899 100644
--- a/1-js/11-async/06-promisify/article.md
+++ b/1-js/11-async/06-promisify/article.md
@@ -4,6 +4,8 @@
 
 Such transformations are often required in real-life, as many functions and libraries are callback-based. But promises are more convenient, so it makes sense to promisify them.
 
+For better understanding, let's see an example.
+
 For instance, we have `loadScript(src, callback)` from the chapter <info:callbacks>.
 
 ```js run
@@ -21,35 +23,42 @@ function loadScript(src, callback) {
 // loadScript('path/script.js', (err, script) => {...})
 ```
 
-Let's promisify it. The new `loadScriptPromise(src)` function achieves the same result, but it accepts only `src` (no `callback`) and returns a promise.
+The function loads a script with the given `src`, and then calls `callback(err)` in case of an error, or `callback(null, script)` in case of successful loading. That's a widespread agreement for using callbacks, we saw it before.
+
+Let's promisify it. 
+
+We'll make a new function `loadScriptPromise(src)`, that does the same (loads the script), but returns a promise instead of using callbacks.
+
+In other words, we pass it only `src` (no `callback`) and get a promise in return, that resolves with `script` when the load is successful, and rejects with the error otherwise.
 
+Here it is:
 ```js
 let loadScriptPromise = function(src) {
   return new Promise((resolve, reject) => {
     loadScript(src, (err, script) => {
-      if (err) reject(err)
+      if (err) reject(err);
       else resolve(script);
     });
-  })
-}
+  });
+};
 
 // usage:
 // loadScriptPromise('path/script.js').then(...)
 ```
 
-Now `loadScriptPromise` fits well in promise-based code.
+As we can see, the new function is a wrapper around the original `loadScript` function. It calls it providing its own callback that translates to promise `resolve/reject`.
 
-As we can see, it delegates all the work to the original `loadScript`, providing its own callback that translates to promise `resolve/reject`.
+Now `loadScriptPromise` fits well in promise-based code. If we like promises more than callbacks (and soon we'll see more reasons for that), then we will use it instead.
 
-In practice we'll probably need to promisify many functions, so it makes sense to use a helper. We'll call it `promisify(f)`: it accepts a to-promisify function `f` and returns a wrapper function.
+In practice we may need to promisify more than one function, so it makes sense to use a helper. 
 
-That wrapper does the same as in the code above: returns a promise and passes the call to the original `f`, tracking the result in a custom callback:
+We'll call it `promisify(f)`: it accepts a to-promisify function `f` and returns a wrapper function.
 
 ```js
 function promisify(f) {
-  return function (...args) { // return a wrapper-function
+  return function (...args) { // return a wrapper-function (*)
     return new Promise((resolve, reject) => {
-      function callback(err, result) { // our custom callback for f
+      function callback(err, result) { // our custom callback for f (**)
         if (err) {
           reject(err);
         } else {
@@ -62,18 +71,25 @@ function promisify(f) {
       f.call(this, ...args); // call the original function
     });
   };
-};
+}
 
 // usage:
 let loadScriptPromise = promisify(loadScript);
 loadScriptPromise(...).then(...);
 ```
 
-Here we assume that the original function expects a callback with two arguments `(err, result)`. That's what we encounter most often. Then our custom callback is in exactly the right format, and `promisify` works great for such a case.
+The code may look a bit complex, but it's essentially the same that we wrote above, while promisifying `loadScript` function.
+
+A call to `promisify(f)` returns a wrapper around `f` `(*)`. That wrapper returns a promise and forwards the call to the original `f`, tracking the result in the custom callback `(**)`.
+
+Here, `promisify` assumes that the original function expects a callback with exactly two arguments `(err, result)`. That's what we encounter most often. Then our custom callback is in exactly the right format, and `promisify` works great for such a case.
 
 But what if the original `f` expects a callback with more arguments `callback(err, res1, res2, ...)`?
 
-Here's a more advanced version of `promisify`: if called as `promisify(f, true)`, the promise result will be an array of callback results `[res1, res2, ...]`:
+We can improve our helper. Let's make a more advanced version of `promisify`.
+
+- When called as `promisify(f)` it should work similar to the version above.
+- When called as `promisify(f, true)`, it should return the promise that resolves with the array of callback results. That's exactly for callbacks with many arguments.
 
 ```js
 // promisify(f, true) to get array of results
@@ -94,13 +110,15 @@ function promisify(f, manyArgs = false) {
       f.call(this, ...args);
     });
   };
-};
+}
 
 // usage:
 f = promisify(f, true);
-f(...).then(arrayOfResults => ..., err => ...)
+f(...).then(arrayOfResults => ..., err => ...);
 ```
 
+As you can see it's essentially the same as above, but `resolve` is called with only one or all arguments depending on whether `manyArgs` is truthy.
+
 For more exotic callback formats, like those without `err` at all: `callback(result)`, we can promisify such functions manually without using the helper.
 
 There are also modules with a bit more flexible promisification functions, e.g. [es6-promisify](https://github.com/digitaldesignlabs/es6-promisify). In Node.js, there's a built-in `util.promisify` function for that.
diff --git a/1-js/11-async/08-async-await/01-rewrite-async/task.md b/1-js/11-async/08-async-await/01-rewrite-async/task.md
index e2fd375d9..a04b4ff94 100644
--- a/1-js/11-async/08-async-await/01-rewrite-async/task.md
+++ b/1-js/11-async/08-async-await/01-rewrite-async/task.md
@@ -12,7 +12,7 @@ function loadJson(url) {
       } else {
         throw new Error(response.status);
       }
-    })
+    });
 }
 
 loadJson('no-such-user.json')
diff --git a/1-js/11-async/08-async-await/02-rewrite-async-2/task.md b/1-js/11-async/08-async-await/02-rewrite-async-2/task.md
index a5c1c03a2..13d625d2a 100644
--- a/1-js/11-async/08-async-await/02-rewrite-async-2/task.md
+++ b/1-js/11-async/08-async-await/02-rewrite-async-2/task.md
@@ -1,7 +1,7 @@
 
 # Rewrite "rethrow" with async/await
 
-Below you can find the "rethrow" example from the chapter <info:promise-chaining>. Rewrite it using `async/await` instead of `.then/catch`.
+Below you can find the "rethrow" example. Rewrite it using `async/await` instead of `.then/catch`.
 
 And get rid of the recursion in favour of a loop in `demoGithubUser`: with `async/await` that becomes easy to do.
 
@@ -22,7 +22,7 @@ function loadJson(url) {
       } else {
         throw new HttpError(response);
       }
-    })
+    });
 }
 
 // Ask for a user name until github returns a valid user
diff --git a/1-js/11-async/08-async-await/03-async-from-regular/task.md b/1-js/11-async/08-async-await/03-async-from-regular/task.md
index 18d0e2ce7..ca7c186ff 100644
--- a/1-js/11-async/08-async-await/03-async-from-regular/task.md
+++ b/1-js/11-async/08-async-await/03-async-from-regular/task.md
@@ -1,7 +1,7 @@
 
 # Call async from non-async
 
-We have a "regular" function. How to call `async` from it and use its result?
+We have a "regular" function called `f`. How can you call the `async` function `wait()` and use its result inside of `f`?
 
 ```js
 async function wait() {
@@ -11,7 +11,7 @@ async function wait() {
 }
 
 function f() {
-  // ...what to write here?
+  // ...what should you write here?
   // we need to call async wait() and wait to get 10
   // remember, we can't use "await"
 }
diff --git a/1-js/11-async/08-async-await/article.md b/1-js/11-async/08-async-await/article.md
index dfb8a9d59..176c691e9 100644
--- a/1-js/11-async/08-async-await/article.md
+++ b/1-js/11-async/08-async-await/article.md
@@ -67,7 +67,7 @@ f();
 
 The function execution "pauses" at the line `(*)` and resumes when the promise settles, with `result` becoming its result. So the code above shows "done!" in one second.
 
-Let's emphasize: `await` literally makes JavaScript wait until the promise settles, and then go on with the result. That doesn't cost any CPU resources, because the engine can do other jobs in the meantime: execute other scripts, handle events, etc.
+Let's emphasize: `await` literally suspends the function execution until the promise settles, and then resumes it with the promise result. That doesn't cost any CPU resources, because the JavaScript engine can do other jobs in the meantime: execute other scripts, handle events, etc.
 
 It's just a more elegant syntax of getting the promise result than `promise.then`, easier to read and write.
 
@@ -83,7 +83,7 @@ function f() {
 }
 ```
 
-We will get this error if we do not put `async` before a function. As said, `await` only works inside an `async function`.
+We may get this error if we forget to put `async` before a function. As said, `await` only works inside an `async` function.
 ````
 
 Let's take the `showAvatar()` example from the chapter <info:promise-chaining> and rewrite it using `async/await`:
@@ -139,9 +139,8 @@ But we can wrap it into an anonymous async function, like this:
   ...
 })();
 ```
-
-
 ````
+
 ````smart header="`await` accepts \"thenables\""
 Like `promise.then`, `await` allows us to use thenable objects (those with a callable `then` method). The idea is that a third-party object may not be a promise, but promise-compatible: if it supports `.then`, that's enough to use it with `await`.
 
@@ -157,7 +156,7 @@ class Thenable {
     // resolve with this.num*2 after 1000ms
     setTimeout(() => resolve(this.num * 2), 1000); // (*)
   }
-};
+}
 
 async function f() {
   // waits for 1 second, then result becomes 2
diff --git a/1-js/12-generators-iterators/2-async-iterators-generators/article.md b/1-js/12-generators-iterators/2-async-iterators-generators/article.md
index 97c8e12a5..00a56b9c3 100644
--- a/1-js/12-generators-iterators/2-async-iterators-generators/article.md
+++ b/1-js/12-generators-iterators/2-async-iterators-generators/article.md
@@ -1,36 +1,48 @@
 
-# Async iterators and generators
+# Async iteration and generators
 
-Asynchronous iterators allow us to iterate over data that comes asynchronously, on-demand. Like, for instance, when we download something chunk-by-chunk over a network. And asynchronous generators make it even more convenient.
+Asynchronous iteration allow us to iterate over data that comes asynchronously, on-demand. Like, for instance, when we download something chunk-by-chunk over a network. And asynchronous generators make it even more convenient.
 
 Let's see a simple example first, to grasp the syntax, and then review a real-life use case.
 
-## Async iterators
+## Recall iterables
 
-Asynchronous iterators are similar to regular iterators, with a few syntactic differences.
+Let's recall the topic about iterables. 
 
-A "regular" iterable object, as described in the chapter <info:iterable>, looks like this:
+The idea is that we have an object, such as `range` here:
+```js
+let range = {
+  from: 1,
+  to: 5
+};
+```
+
+...And we'd like to use `for..of` loop on it, such as `for(value of range)`, to get values from `1` to `5`.
+
+In other words, we want to add an *iteration ability* to the object.
+
+That can be implemented using a special method with the name `Symbol.iterator`:
+
+- This method is called in by the `for..of` construct when the loop is started, and it should return an object with the `next` method.
+- For each iteration, the `next()` method is invoked for the next value.
+- The `next()` should return a value in the form `{done: true/false, value:<loop value>}`, where `done:true` means the end of the loop.
+
+Here's an implementation for the iterable `range`:
 
 ```js run
 let range = {
   from: 1,
   to: 5,
 
-  // for..of calls this method once in the very beginning
 *!*
-  [Symbol.iterator]() {
+  [Symbol.iterator]() { // called once, in the beginning of for..of
 */!*
-    // ...it returns the iterator object:
-    // onward, for..of works only with that object,
-    // asking it for next values using next()
     return {
       current: this.from,
       last: this.to,
 
-      // next() is called on each iteration by the for..of loop
 *!*
-      next() { // (2)
-        // it should return the value as an object {done:.., value :...}
+      next() { // called every iteration, to get the next value
 */!*
         if (this.current <= this.last) {
           return { done: false, value: this.current++ };
@@ -47,40 +59,44 @@ for(let value of range) {
 }
 ```
 
-If necessary, please refer to the [chapter about iterables](info:iterable) for details about regular iterators.
+If anything is unclear, please visit the chapter [](info:iterable), it gives all the details about regular iterables.
+
+## Async iterables
+
+Asynchronous iteration is needed when values come asynchronously: after `setTimeout` or another kind of delay. 
+
+The most common case is that the object needs to make a network request to deliver the next value, we'll see a real-life example of it a bit later.
 
-To make the object iterable asynchronously:
-1. We need to use `Symbol.asyncIterator` instead of `Symbol.iterator`.
-2. `next()` should return a promise.
+To make an object iterable asynchronously:
+
+1. Use `Symbol.asyncIterator` instead of `Symbol.iterator`.
+2. The `next()` method should return a promise (to be fulfilled with the next value).
+    - The `async` keyword handles it, we can simply make `async next()`.
 3. To iterate over such an object, we should use a `for await (let item of iterable)` loop.
+    - Note the `await` word.
+
+As a starting example, let's make an iterable `range` object, similar like the one before, but now it will return values asynchronously, one per second.
 
-Let's make an iterable `range` object, like the one before, but now it will return values asynchronously, one per second:
+All we need to do is to perform a few replacements in the code above:
 
 ```js run
 let range = {
   from: 1,
   to: 5,
 
-  // for await..of calls this method once in the very beginning
 *!*
   [Symbol.asyncIterator]() { // (1)
 */!*
-    // ...it returns the iterator object:
-    // onward, for await..of works only with that object,
-    // asking it for next values using next()
     return {
       current: this.from,
       last: this.to,
 
-      // next() is called on each iteration by the for await..of loop
 *!*
       async next() { // (2)
-        // it should return the value as an object {done:.., value :...}
-        // (automatically wrapped into a promise by async)
 */!*
 
 *!*
-        // can use await inside, do async stuff:
+        // note: we can use "await" inside the async next:
         await new Promise(resolve => setTimeout(resolve, 1000)); // (3)
 */!*
 
@@ -112,7 +128,7 @@ As we can see, the structure is similar to regular iterators:
 3. The `next()` method doesn't have to be `async`, it may be a regular method returning a promise, but `async` allows us to use `await`, so that's convenient. Here we just delay for a second `(3)`.
 4. To iterate, we use `for await(let value of range)` `(4)`, namely add "await" after "for". It calls `range[Symbol.asyncIterator]()` once, and then its `next()` for values.
 
-Here's a small cheatsheet:
+Here's a small table with the differences:
 
 |       | Iterators | Async iterators |
 |-------|-----------|-----------------|
@@ -128,14 +144,20 @@ For instance, a spread syntax won't work:
 alert( [...range] ); // Error, no Symbol.iterator
 ```
 
-That's natural, as it expects to find `Symbol.iterator`, same as `for..of` without `await`. Not `Symbol.asyncIterator`.
+That's natural, as it expects to find `Symbol.iterator`, not `Symbol.asyncIterator`.
+
+It's also the case for `for..of`: the syntax without `await` needs `Symbol.iterator`.
 ````
 
-## Async generators
+## Recall generators
+
+Now let's recall generators, as they allow to make iteration code much shorter. Most of the time, when we'd like to make an iterable, we'll use generators.
+
+For sheer simplicity, omitting some important stuff, they are "functions that generate (yield) values". They are explained in detail in the chapter [](info:generators).
 
-As we already know, JavaScript also supports generators, and they are iterable.
+Generators are labelled with `function*` (note the star) and use `yield` to generate a value, then we can use `for..of` to loop over them.
 
-Let's recall a sequence generator from the chapter [](info:generators). It generates a sequence of values from `start` to `end`:
+This example generates a sequence of values from `start` to `end`:
 
 ```js run
 function* generateSequence(start, end) {
@@ -149,11 +171,54 @@ for(let value of generateSequence(1, 5)) {
 }
 ```
 
-In regular generators we can't use `await`. All values must come synchronously: there's no place for delay in `for..of`, it's a synchronous construct.
+As we already know, to make an object iterable, we should add `Symbol.iterator` to it.
 
-But what if we need to use `await` in the generator body? To perform network requests, for instance.
+```js
+let range = {
+  from: 1,
+  to: 5,
+*!*
+  [Symbol.iterator]() {
+    return <object with next to make range iterable>
+  }
+*/!*
+}
+```
 
-No problem, just prepend it with `async`, like this:
+A common practice for `Symbol.iterator` is to return a generator, it makes the code shorter, as you can see:
+
+```js run
+let range = {
+  from: 1,
+  to: 5,
+
+  *[Symbol.iterator]() { // a shorthand for [Symbol.iterator]: function*()
+    for(let value = this.from; value <= this.to; value++) {
+      yield value;
+    }
+  }
+};
+
+for(let value of range) {
+  alert(value); // 1, then 2, then 3, then 4, then 5
+}
+```
+
+Please see the chapter [](info:generators) if you'd like more details.
+
+In regular generators we can't use `await`. All values must come synchronously, as required by the `for..of` construct.
+
+What if we'd like to generate values asynchronously? From network requests, for instance. 
+
+Let's switch to asynchronous generators to make it possible.
+
+## Async generators (finally)
+
+For most practical applications, when we'd like to make an object that asynchronously generates a sequence of values, we can use an asynchronous generator.
+
+The syntax is simple: prepend `function*` with `async`. That makes the generator asynchronous.
+
+And then use `for await (...)` to iterate over it, like this:
 
 ```js run
 *!*async*/!* function* generateSequence(start, end) {
@@ -161,7 +226,7 @@ No problem, just prepend it with `async`, like this:
   for (let i = start; i <= end; i++) {
 
 *!*
-    // yay, can use await!
+    // Wow, can use await!
     await new Promise(resolve => setTimeout(resolve, 1000));
 */!*
 
@@ -174,72 +239,43 @@ No problem, just prepend it with `async`, like this:
 
   let generator = generateSequence(1, 5);
   for *!*await*/!* (let value of generator) {
-    alert(value); // 1, then 2, then 3, then 4, then 5
+    alert(value); // 1, then 2, then 3, then 4, then 5 (with delay between)
   }
 
 })();
 ```
 
-Now we have the async generator, iterable with `for await...of`.
+As the generator is asynchronous, we can use `await` inside it, rely on promises, perform network requests and so on.
 
-It's indeed very simple. We add the `async` keyword, and the generator now can use `await` inside of it, rely on promises and other async functions.
+````smart header="Under-the-hood difference"
+Technically, if you're an advanced reader who remembers the details about generators, there's an internal difference.
 
-Technically, another difference of an async generator is that its `generator.next()` method is now asynchronous also, it returns promises.
+For async generators, the `generator.next()` method is asynchronous, it returns promises.
 
 In a regular generator we'd use `result = generator.next()` to get values. In an async generator, we should add `await`, like this:
 
 ```js
 result = await generator.next(); // result = {value: ..., done: true/false}
 ```
+That's why async generators work with `for await...of`.
+````
 
-## Async iterables
-
-As we already know, to make an object iterable, we should add `Symbol.iterator` to it.
-
-```js
-let range = {
-  from: 1,
-  to: 5,
-*!*
-  [Symbol.iterator]() {
-    return <object with next to make range iterable>
-  }
-*/!*
-}
-```
-
-A common practice for `Symbol.iterator` is to return a generator, rather than a plain object with `next` as in the example before.
-
-Let's recall an example from the chapter [](info:generators):
-
-```js run
-let range = {
-  from: 1,
-  to: 5,
-
-  *[Symbol.iterator]() { // a shorthand for [Symbol.iterator]: function*()
-    for(let value = this.from; value <= this.to; value++) {
-      yield value;
-    }
-  }
-};
+### Async iterable range
 
-for(let value of range) {
-  alert(value); // 1, then 2, then 3, then 4, then 5
-}
-```
+Regular generators can be used as `Symbol.iterator` to make the iteration code shorter.
 
-Here a custom object `range` is iterable, and the generator `*[Symbol.iterator]` implements the logic for listing values.
+Similar to that, async generators can be used as `Symbol.asyncIterator` to implement the asynchronous iteration.
 
-If we'd like to add async actions into the generator, then we should replace `Symbol.iterator` with async `Symbol.asyncIterator`:
+For instance, we can make the `range` object generate values asynchronously, once per second, by replacing synchronous `Symbol.iterator` with asynchronous `Symbol.asyncIterator`:
 
 ```js run
 let range = {
   from: 1,
   to: 5,
 
+  // this line is same as [Symbol.asyncIterator]: async function*() {
 *!*
-  async *[Symbol.asyncIterator]() { // same as [Symbol.asyncIterator]: async function*()
+  async *[Symbol.asyncIterator]() {
 */!*
     for(let value = this.from; value <= this.to; value++) {
 
@@ -262,31 +298,39 @@ let range = {
 
 Now values come with a delay of 1 second between them.
 
-## Real-life example
+```smart
+Technically, we can add both `Symbol.iterator` and `Symbol.asyncIterator` to the object, so it's both synchronously (`for..of`) and asynchronously (`for await..of`) iterable.
+
+In practice though, that would be a weird thing to do.
+```
+
+## Real-life example: paginated data
 
-So far we've seen simple examples, to gain basic understanding. Now let's review a real-life use case.
+So far we've seen basic examples, to gain understanding. Now let's review a real-life use case.
 
 There are many online services that deliver paginated data. For instance, when we need a list of users, a request returns a pre-defined count (e.g. 100 users) - "one page", and provides a URL to the next page.
 
-This pattern is very common. It's not about users, but just about anything. For instance, GitHub allows us to retrieve commits in the same, paginated fashion:
+This pattern is very common. It's not about users, but just about anything. 
+
+For instance, GitHub allows us to retrieve commits in the same, paginated fashion:
 
-- We should make a request to URL in the form `https://api.github.com/repos/<repo>/commits`.
+- We should make a request to `fetch` in the form `https://api.github.com/repos/<repo>/commits`.
 - It responds with a JSON of 30 commits, and also provides a link to the next page in the `Link` header.
 - Then we can use that link for the next request, to get more commits, and so on.
 
-But we'd like to have a simpler API: an iterable object with commits, so that we could go over them like this:
+For our code, we'd like to have a simpler way to get commits.
 
-```js
-let repo = 'javascript-tutorial/en.javascript.info'; // GitHub repository to get commits from
+Let's make a function `fetchCommits(repo)` that gets commits for us, making requests whenever needed. And let it care about all pagination stuff. For us it'll be a simple async iteration `for await..of`.
 
-for await (let commit of fetchCommits(repo)) {
+So the usage will be like this:
+
+```js
+for await (let commit of fetchCommits("username/repository")) {
   // process commit
 }
 ```
 
-We'd like to make a function `fetchCommits(repo)` that gets commits for us, making requests whenever needed. And let it care about all pagination stuff. For us it'll be a simple `for await..of`.
-
-With async generators that's pretty easy to implement:
+Here's such function, implemented as async generator:
 
 ```js
 async function* fetchCommits(repo) {
@@ -294,7 +338,7 @@ async function* fetchCommits(repo) {
 
   while (url) {
     const response = await fetch(url, { // (1)
-      headers: {'User-Agent': 'Our script'}, // github requires user-agent header
+      headers: {'User-Agent': 'Our script'}, // github needs any user-agent header
     });
 
     const body = await response.json(); // (2) response is JSON (array of commits)
@@ -312,10 +356,16 @@ async function* fetchCommits(repo) {
 }
 ```
 
-1. We use the browser [fetch](info:fetch) method to download from a remote URL. It allows us to supply authorization and other headers if needed -- here GitHub requires `User-Agent`.
-2. The fetch result is parsed as JSON. That's again a `fetch`-specific method.
-3. We should get the next page URL from the `Link` header of the response. It has a special format, so we use a regexp for that. The next page URL may look like `https://api.github.com/repositories/93253246/commits?page=2`. It's generated by GitHub itself.
-4. Then we yield all commits received, and when they finish, the next `while(url)` iteration will trigger, making one more request.
+More explanations about how it works:
+
+1. We use the browser [fetch](info:fetch) method to download the commits.
+
+    - The initial URL is `https://api.github.com/repos/<repo>/commits`, and the next page will be in the `Link` header of the response.
+    - The `fetch` method allows us to supply authorization and other headers if needed -- here GitHub requires `User-Agent`.
+2. The commits are returned in JSON format.
+3. We should get the next page URL from the `Link` header of the response. It has a special format, so we use a regular expression for that (we will lern this feature in [Regular expressions](info:regular-expressions)).
+    - The next page URL may look like `https://api.github.com/repositories/93253246/commits?page=2`. It's generated by GitHub itself.
+4. Then we yield the received commits one by one, and when they finish, the next `while(url)` iteration will trigger, making one more request.
 
 An example of use (shows commit authors in console):
 
@@ -336,7 +386,9 @@ An example of use (shows commit authors in console):
 })();
 ```
 
-That's just what we wanted. The internal mechanics of paginated requests is invisible from the outside. For us it's just an async generator that returns commits.
+That's just what we wanted. 
+
+The internal mechanics of paginated requests is invisible from the outside. For us it's just an async generator that returns commits.
 
 ## Summary
 
diff --git a/1-js/13-modules/01-modules-intro/article.md b/1-js/13-modules/01-modules-intro/article.md
index e9e1fc249..9afe0fdaa 100644
--- a/1-js/13-modules/01-modules-intro/article.md
+++ b/1-js/13-modules/01-modules-intro/article.md
@@ -260,7 +260,7 @@ Compare to regular script below:
 
 <script>
 *!*
-  alert(typeof button); // Error: button is undefined, the script can't see elements below
+  alert(typeof button); // button is undefined, the script can't see elements below
 */!*
   // regular scripts run immediately, before the rest of the page is processed
 </script>
diff --git a/1-js/13-modules/02-import-export/article.md b/1-js/13-modules/02-import-export/article.md
index 4bd41a168..497205f42 100644
--- a/1-js/13-modules/02-import-export/article.md
+++ b/1-js/13-modules/02-import-export/article.md
@@ -321,7 +321,7 @@ export {default as User} from './user.js'; // re-export default
 
 Why would that be needed? Let's see a practical use case.
 
-Imagine, we're writing a "package": a folder with a lot of modules, with some of the functionality exported outside (tools like NPM allow us to publish and distribute such packages), and many modules are just "helpers", for internal use in other package modules.
+Imagine, we're writing a "package": a folder with a lot of modules, with some of the functionality exported outside (tools like NPM allow us to publish and distribute such packages, but we don't have to use them), and many modules are just "helpers", for internal use in other package modules.
 
 The file structure could be like this:
 ```
@@ -378,7 +378,7 @@ export {default as User} from './user.js';
 
 The default export needs separate handling when re-exporting.
 
-Let's say we have `user.js`, and we'd like to re-export class `User` from it:
+Let's say we have `user.js` with the `export default class User` and would like to re-export it:
 
 ```js
 // 📁 user.js
@@ -387,7 +387,9 @@ export default class User {
 }
 ```
 
-1. `export User from './user.js'` won't work. What can go wrong?... But that's a syntax error!
+We can come across two problems with it:
+
+1. `export User from './user.js'` won't work. That would lead to a syntax error.
 
     To re-export the default export, we have to write `export {default as User}`, as in the example above.    
 
@@ -399,7 +401,7 @@ export default class User {
     export {default} from './user.js'; // to re-export the default export
     ```
 
-Such oddities of re-exporting the default export are one of the reasons why some developers don't like them.
+Such oddities of re-exporting a default export are one of the reasons why some developers don't like default exports and prefer named ones.
 
 ## Summary
 
diff --git a/1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md b/1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md
index 357a57313..9db69cb2f 100644
--- a/1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md
+++ b/1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md
@@ -19,5 +19,5 @@ function wrap(target) {
 user = wrap(user);
 
 alert(user.name); // John
-alert(user.age); // ReferenceError: Property doesn't exist "age"
+alert(user.age); // ReferenceError: Property doesn't exist: "age"
 ```
diff --git a/1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md b/1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md
index 827cf35e3..47985e1a7 100644
--- a/1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md
+++ b/1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md
@@ -1,8 +1,8 @@
-# Error on reading non-existant property
+# Error on reading non-existent property
 
-Usually, an attempt to read a non-existant property returns `undefined`.
+Usually, an attempt to read a non-existent property returns `undefined`.
 
-Create a proxy that throws an error for an attempt to read of a non-existant property instead.
+Create a proxy that throws an error for an attempt to read of a non-existent property instead.
 
 That can help to detect programming mistakes early.
 
@@ -27,6 +27,6 @@ user = wrap(user);
 
 alert(user.name); // John
 *!*
-alert(user.age); // ReferenceError: Property doesn't exist "age"
+alert(user.age); // ReferenceError: Property doesn't exist: "age"
 */!*
 ```
diff --git a/1-js/99-js-misc/01-proxy/article.md b/1-js/99-js-misc/01-proxy/article.md
index a4aec1fe5..b1c351d3a 100644
--- a/1-js/99-js-misc/01-proxy/article.md
+++ b/1-js/99-js-misc/01-proxy/article.md
@@ -39,7 +39,7 @@ As there are no traps, all operations on `proxy` are forwarded to `target`.
 
 As we can see, without any traps, `proxy` is a transparent wrapper around `target`.
 
-![](proxy.svg)  
+![](proxy.svg)
 
 `Proxy` is a special "exotic object". It doesn't have own properties. With an empty `handler` it transparently forwards operations to `target`.
 
@@ -61,13 +61,13 @@ For every internal method, there's a trap in this table: the name of the method
 | `[[Delete]]` | `deleteProperty` | `delete` operator |
 | `[[Call]]` | `apply` | function call |
 | `[[Construct]]` | `construct` | `new` operator |
-| `[[GetPrototypeOf]]` | `getPrototypeOf` | [Object.getPrototypeOf](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf) |
-| `[[SetPrototypeOf]]` | `setPrototypeOf` | [Object.setPrototypeOf](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf) |
-| `[[IsExtensible]]` | `isExtensible` | [Object.isExtensible](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible) |
-| `[[PreventExtensions]]` | `preventExtensions` | [Object.preventExtensions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions) |
-| `[[DefineOwnProperty]]` | `defineProperty` | [Object.defineProperty](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty), [Object.defineProperties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties) |
-| `[[GetOwnProperty]]` | `getOwnPropertyDescriptor` | [Object.getOwnPropertyDescriptor](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor), `for..in`, `Object.keys/values/entries` |
-| `[[OwnPropertyKeys]]` | `ownKeys` | [Object.getOwnPropertyNames](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames), [Object.getOwnPropertySymbols](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols), `for..in`, `Object/keys/values/entries` |
+| `[[GetPrototypeOf]]` | `getPrototypeOf` | [Object.getPrototypeOf](mdn:/JavaScript/Reference/Global_Objects/Object/getPrototypeOf) |
+| `[[SetPrototypeOf]]` | `setPrototypeOf` | [Object.setPrototypeOf](mdn:/JavaScript/Reference/Global_Objects/Object/setPrototypeOf) |
+| `[[IsExtensible]]` | `isExtensible` | [Object.isExtensible](mdn:/JavaScript/Reference/Global_Objects/Object/isExtensible) |
+| `[[PreventExtensions]]` | `preventExtensions` | [Object.preventExtensions](mdn:/JavaScript/Reference/Global_Objects/Object/preventExtensions) |
+| `[[DefineOwnProperty]]` | `defineProperty` | [Object.defineProperty](mdn:/JavaScript/Reference/Global_Objects/Object/defineProperty), [Object.defineProperties](mdn:/JavaScript/Reference/Global_Objects/Object/defineProperties) |
+| `[[GetOwnProperty]]` | `getOwnPropertyDescriptor` | [Object.getOwnPropertyDescriptor](mdn:/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor), `for..in`, `Object.keys/values/entries` |
+| `[[OwnPropertyKeys]]` | `ownKeys` | [Object.getOwnPropertyNames](mdn:/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames), [Object.getOwnPropertySymbols](mdn:/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols), `for..in`, `Object/keys/values/entries` |
 
 ```warn header="Invariants"
 JavaScript enforces some invariants -- conditions that must be fulfilled by internal methods and traps.
@@ -335,7 +335,7 @@ let user = {
   _password: "secret"
 };
 
-alert(user._password); // secret  
+alert(user._password); // secret
 ```
 
 Let's use proxies to prevent any access to properties starting with `_`.
@@ -376,7 +376,7 @@ user = new Proxy(user, {
   },
 *!*
   deleteProperty(target, prop) { // to intercept property deletion
-*/!*  
+*/!*
     if (prop.startsWith('_')) {
       throw new Error("Access denied");
     } else {
@@ -437,7 +437,7 @@ user = {
 ```
 
 
-A call to `user.checkPassword()` call gets proxied `user` as `this` (the object before dot becomes `this`), so when it tries to access `this._password`, the `get` trap activates (it triggers on any property read) and throws an error.
+A call to `user.checkPassword()` gets proxied `user` as `this` (the object before dot becomes `this`), so when it tries to access `this._password`, the `get` trap activates (it triggers on any property read) and throws an error.
 
 So we bind the context of object methods to the original object, `target`, in the line `(*)`. Then their future calls will use `target` as `this`, without any traps.
 
@@ -840,7 +840,7 @@ So there's no such problem when proxying an array.
 
 ### Private fields
 
-The similar thing happens with private class fields.
+A similar thing happens with private class fields.
 
 For example, `getName()` method accesses the private `#name` property and breaks after proxying:
 
@@ -963,7 +963,7 @@ revoke();
 alert(proxy.data); // Error
 ```
 
-A call to `revoke()` removes all internal references to the target object from the proxy, so they are no more connected. The target object can be garbage-collected after that.
+A call to `revoke()` removes all internal references to the target object from the proxy, so they are no longer connected. The target object can be garbage-collected after that.
 
 We can also store `revoke` in a `WeakMap`, to be able to easily find it by a proxy object:
 
@@ -994,7 +994,7 @@ We use `WeakMap` instead of `Map` here because it won't block garbage collection
 ## References
 
 - Specification: [Proxy](https://tc39.es/ecma262/#sec-proxy-object-internal-methods-and-internal-slots).
-- MDN: [Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy).
+- MDN: [Proxy](mdn:/JavaScript/Reference/Global_Objects/Proxy).
 
 ## Summary
 
@@ -1016,13 +1016,13 @@ We can trap:
 - Reading (`get`), writing (`set`), deleting (`deleteProperty`) a property (even a non-existing one).
 - Calling a function (`apply` trap).
 - The `new` operator (`construct` trap).
-- Many other operations (the full list is at the beginning of the article and in the [docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy)).
+- Many other operations (the full list is at the beginning of the article and in the [docs](mdn:/JavaScript/Reference/Global_Objects/Proxy)).
 
 That allows us to create "virtual" properties and methods, implement default values, observable objects, function decorators and so much more.
 
 We can also wrap an object multiple times in different proxies, decorating it with various aspects of functionality.
 
-The [Reflect](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect) API is designed to complement [Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy). For any `Proxy` trap, there's a `Reflect` call with same arguments. We should use those to forward calls to target objects.
+The [Reflect](mdn:/JavaScript/Reference/Global_Objects/Reflect) API is designed to complement [Proxy](mdn:/JavaScript/Reference/Global_Objects/Proxy). For any `Proxy` trap, there's a `Reflect` call with same arguments. We should use those to forward calls to target objects.
 
 Proxies have some limitations:
 
diff --git a/1-js/99-js-misc/04-reference-type/3-why-this/solution.md b/1-js/99-js-misc/04-reference-type/3-why-this/solution.md
index 31ea4ff88..e4ee78748 100644
--- a/1-js/99-js-misc/04-reference-type/3-why-this/solution.md
+++ b/1-js/99-js-misc/04-reference-type/3-why-this/solution.md
@@ -5,7 +5,7 @@ Here's the explanations.
 
 2. The same, parentheses do not change the order of operations here, the dot is first anyway.
 
-3. Here we have a more complex call `(expression).method()`. The call works as if it were split into two lines:
+3. Here we have a more complex call `(expression)()`. The call works as if it were split into two lines:
 
     ```js no-beautify
     f = obj.go; // calculate the expression
@@ -14,7 +14,7 @@ Here's the explanations.
 
     Here `f()` is executed as a function, without `this`.
 
-4. The similar thing as `(3)`, to the left of the dot `.` we have an expression.
+4. The similar thing as `(3)`, to the left of the parentheses `()` we have an expression.
 
 To explain the behavior of `(3)` and `(4)` we need to recall that property accessors (dot or square brackets) return a value of the Reference Type.  
 
diff --git a/1-js/99-js-misc/04-reference-type/article.md b/1-js/99-js-misc/04-reference-type/article.md
index ef843ab79..227253436 100644
--- a/1-js/99-js-misc/04-reference-type/article.md
+++ b/1-js/99-js-misc/04-reference-type/article.md
@@ -93,7 +93,7 @@ Reference type is a special "intermediary" internal type, with the purpose to pa
 
 Any other operation like assignment `hi = user.hi` discards the reference type as a whole, takes the value of `user.hi` (a function) and passes it on. So any further operation "loses" `this`.
 
-So, as the result, the value of `this` is only passed the right way if the function is called directly using a dot `obj.method()` or square brackets `obj['method']()` syntax (they do the same here). Later in this tutorial, we will learn various ways to solve this problem such as [func.bind()](/bind#solution-2-bind).
+So, as the result, the value of `this` is only passed the right way if the function is called directly using a dot `obj.method()` or square brackets `obj['method']()` syntax (they do the same here). There are various ways to solve this problem such as [func.bind()](/bind#solution-2-bind).
 
 ## Summary
 
@@ -106,9 +106,3 @@ That's for the subsequent method call `()` to get the object and set `this` to i
 For all other operations, the reference type automatically becomes the property value (a function in our case).
 
 The whole mechanics is hidden from our eyes. It only matters in subtle cases, such as when a method is obtained dynamically from the object, using an expression.
-
-
-
-
-
- result of dot `.` isn't actually a method, but a value of `` needs a way to pass the information about `obj`
diff --git a/1-js/99-js-misc/05-bigint/article.md b/1-js/99-js-misc/05-bigint/article.md
index 72f06d0c7..2a1cfc843 100644
--- a/1-js/99-js-misc/05-bigint/article.md
+++ b/1-js/99-js-misc/05-bigint/article.md
@@ -50,7 +50,7 @@ The conversion operations are always silent, never give errors, but if the bigin
 ````smart header="The unary plus is not supported on bigints"
 The unary plus operator `+value` is a well-known way to convert `value` to a number.
 
-On bigints it's not supported, to avoid confusion:
+In order to avoid confusion, it's not supported on bigints:
 ```js run
 let bigint = 1n;
 
@@ -126,5 +126,5 @@ We can use such JSBI code "as is" for engines that don't support bigints and for
 
 ## References
 
-- [MDN docs on BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt).
+- [MDN docs on BigInt](mdn:/JavaScript/Reference/Global_Objects/BigInt).
 - [Specification](https://tc39.es/ecma262/#sec-bigint-objects).
diff --git a/2-ui/1-document/04-searching-elements-dom/article.md b/2-ui/1-document/04-searching-elements-dom/article.md
index f5ab0b785..70a8bae4c 100644
--- a/2-ui/1-document/04-searching-elements-dom/article.md
+++ b/2-ui/1-document/04-searching-elements-dom/article.md
@@ -71,7 +71,7 @@ If there are multiple elements with the same `id`, then the behavior of methods
 ```
 
 ```warn header="Only `document.getElementById`, not `anyElem.getElementById`"
-The method `getElementById` that can be called only on `document` object. It looks for the given `id` in the whole document.
+The method `getElementById` can be called only on `document` object. It looks for the given `id` in the whole document.
 ```
 
 ## querySelectorAll [#querySelectorAll]
@@ -363,7 +363,7 @@ There are 6 main methods to search for nodes in DOM:
 </tbody>
 </table>
 
-By far the most used are `querySelector` and `querySelectorAll`, but `getElementBy*` can be sporadically helpful or found in the old scripts.
+By far the most used are `querySelector` and `querySelectorAll`, but `getElement(s)By*` can be sporadically helpful or found in the old scripts.
 
 Besides that:
 
diff --git a/2-ui/1-document/05-basic-dom-node-properties/article.md b/2-ui/1-document/05-basic-dom-node-properties/article.md
index 76469c187..fc3bf6525 100644
--- a/2-ui/1-document/05-basic-dom-node-properties/article.md
+++ b/2-ui/1-document/05-basic-dom-node-properties/article.md
@@ -198,7 +198,7 @@ In XML mode the case is kept "as is". Nowadays XML mode is rarely used.
 
 ## innerHTML: the contents
 
-The [innerHTML](https://w3c.github.io/DOM-Parsing/#widl-Element-innerHTML) property allows to get the HTML inside the element as a string.
+The [innerHTML](https://w3c.github.io/DOM-Parsing/#the-innerhtml-mixin) property allows to get the HTML inside the element as a string.
 
 We can also modify it. So it's one of the most powerful ways to change the page.
 
@@ -397,7 +397,7 @@ Compare the two:
 <div id="elem2"></div>
 
 <script>
-  let name = prompt("What's your name?", "<b>Winnie-the-pooh!</b>");
+  let name = prompt("What's your name?", "<b>Winnie-the-Pooh!</b>");
 
   elem1.innerHTML = name;
   elem2.textContent = name;
@@ -405,7 +405,7 @@ Compare the two:
 ```
 
 1. The first `<div>` gets the name "as HTML": all tags become tags, so we see the bold name.
-2. The second `<div>` gets the name "as text", so we literally see `<b>Winnie-the-pooh!</b>`.
+2. The second `<div>` gets the name "as text", so we literally see `<b>Winnie-the-Pooh!</b>`.
 
 In most cases, we expect the text from a user, and want to treat it as text. We don't want unexpected HTML in our site. An assignment to `textContent` does exactly that.
 
@@ -413,7 +413,7 @@ In most cases, we expect the text from a user, and want to treat it as text. We
 
 The "hidden" attribute and the DOM property specifies whether the element is visible or not.
 
-We can use it in HTML or assign using JavaScript, like this:
+We can use it in HTML or assign it using JavaScript, like this:
 
 ```html run height="80"
 <div>Both divs below are hidden</div>
diff --git a/2-ui/1-document/06-dom-attributes-and-properties/article.md b/2-ui/1-document/06-dom-attributes-and-properties/article.md
index bcbf074ce..e39a54256 100644
--- a/2-ui/1-document/06-dom-attributes-and-properties/article.md
+++ b/2-ui/1-document/06-dom-attributes-and-properties/article.md
@@ -298,7 +298,7 @@ For instance, here for the order state the attribute `order-state` is used:
 </div>
 ```
 
-Why would using an attribute be preferable to having classes like `.order-state-new`, `.order-state-pending`, `order-state-canceled`?
+Why would using an attribute be preferable to having classes like `.order-state-new`, `.order-state-pending`, `.order-state-canceled`?
 
 Because an attribute is more convenient to manage. The state can be changed as easy as:
 
diff --git a/2-ui/1-document/07-modifying-document/article.md b/2-ui/1-document/07-modifying-document/article.md
index 9a2677df4..75ce1fbb0 100644
--- a/2-ui/1-document/07-modifying-document/article.md
+++ b/2-ui/1-document/07-modifying-document/article.md
@@ -61,7 +61,7 @@ let div = document.createElement('div');
 // 2. Set its class to "alert"
 div.className = "alert";
 
-// Fill it with the content
+// 3. Fill it with the content
 div.innerHTML = "<strong>Hi there!</strong> You've read an important message.";
 ```
 
diff --git a/2-ui/1-document/10-size-and-scroll-window/article.md b/2-ui/1-document/10-size-and-scroll-window/article.md
index 10898dbf7..95a5cd48b 100644
--- a/2-ui/1-document/10-size-and-scroll-window/article.md
+++ b/2-ui/1-document/10-size-and-scroll-window/article.md
@@ -2,11 +2,11 @@
 
 How do we find the width and height of the browser window? How do we get the full width and height of the document, including the scrolled out part? How do we scroll the page using JavaScript?
 
-For most such requests, we can use the root document element `document.documentElement`, that corresponds to the `<html>` tag. But there are additional methods and peculiarities important enough to consider.
+For this type of information, we can use the root document element `document.documentElement`, that corresponds to the `<html>` tag. But there are additional methods and peculiarities to consider.
 
 ## Width/height of the window
 
-To get window width and height we can use `clientWidth/clientHeight` of `document.documentElement`:
+To get window width and height, we can use the `clientWidth/clientHeight` of `document.documentElement`:
 
 ![](document-client-width-height.svg)
 
@@ -16,12 +16,12 @@ For instance, this button shows the height of your window:
 <button onclick="alert(document.documentElement.clientHeight)">alert(document.documentElement.clientHeight)</button>
 ```
 
-````warn header="Not `window.innerWidth/Height`"
-Browsers also support properties `window.innerWidth/innerHeight`. They look like what we want. So why not to use them instead?
+````warn header="Not `window.innerWidth/innerHeight`"
+Browsers also support properties like `window.innerWidth/innerHeight`. They look like what we want, so why not to use them instead?
 
-If there exists a scrollbar, and it occupies some space, `clientWidth/clientHeight` provide the width/height without it (subtract it). In other words, they return width/height of the visible part of the document, available for the content.
+If there exists a scrollbar, and it occupies some space, `clientWidth/clientHeight` provide the width/height without it (subtract it). In other words, they return the width/height of the visible part of the document, available for the content.
 
-...And `window.innerWidth/innerHeight` include the scrollbar.
+`window.innerWidth/innerHeight` includes the scrollbar.
 
 If there's a scrollbar, and it occupies some space, then these two lines show different values:
 ```js run
@@ -29,7 +29,7 @@ alert( window.innerWidth ); // full window width
 alert( document.documentElement.clientWidth ); // window width minus the scrollbar
 ```
 
-In most cases we need the *available* window width: to draw or position something. That is: inside scrollbars if there are any. So we should use `documentElement.clientHeight/Width`.
+In most cases, we need the *available* window width in order to draw or position something within scrollbars (if there are any), so we should use `documentElement.clientHeight/clientWidth`.
 ````
 
 ```warn header="`DOCTYPE` is important"
@@ -40,9 +40,9 @@ In modern HTML we should always write `DOCTYPE`.
 
 ## Width/height of the document
 
-Theoretically, as the root document element is `document.documentElement`, and it encloses all the content, we could measure document full size as `document.documentElement.scrollWidth/scrollHeight`.
+Theoretically, as the root document element is `document.documentElement`, and it encloses all the content, we could measure the document's full size as `document.documentElement.scrollWidth/scrollHeight`.
 
-But on that element, for the whole page, these properties do not work as intended. In Chrome/Safari/Opera if there's no scroll, then `documentElement.scrollHeight` may be even less than  `documentElement.clientHeight`! Sounds like a nonsense, weird, right?
+But on that element, for the whole page, these properties do not work as intended. In Chrome/Safari/Opera, if there's no scroll, then `documentElement.scrollHeight` may be even less than `documentElement.clientHeight`! Weird, right?
 
 To reliably obtain the full document height, we should take the maximum of these properties:
 
@@ -60,11 +60,11 @@ Why so? Better don't ask. These inconsistencies come from ancient times, not a "
 
 ## Get the current scroll [#page-scroll]
 
-DOM elements have their current scroll state in `elem.scrollLeft/scrollTop`.
+DOM elements have their current scroll state in their `scrollLeft/scrollTop` properties.
 
-For document scroll `document.documentElement.scrollLeft/Top` works in most browsers, except older WebKit-based ones, like Safari (bug [5991](https://bugs.webkit.org/show_bug.cgi?id=5991)), where we should use `document.body` instead of `document.documentElement`.
+For document scroll, `document.documentElement.scrollLeft/scrollTop` works in most browsers, except older WebKit-based ones, like Safari (bug [5991](https://bugs.webkit.org/show_bug.cgi?id=5991)), where we should use `document.body` instead of `document.documentElement`.
 
-Luckily, we don't have to remember these peculiarities at all, because the scroll is available in the special properties `window.pageXOffset/pageYOffset`:
+Luckily, we don't have to remember these peculiarities at all, because the scroll is available in the special properties, `window.pageXOffset/pageYOffset`:
 
 ```js run
 alert('Current scroll from the top: ' + window.pageYOffset);
@@ -76,16 +76,16 @@ These properties are read-only.
 ## Scrolling: scrollTo, scrollBy, scrollIntoView [#window-scroll]
 
 ```warn
-To scroll the page from JavaScript, its DOM must be fully built.
+To scroll the page with JavaScript, its DOM must be fully built.
 
-For instance, if we try to scroll the page from the script in `<head>`, it won't work.
+For instance, if we try to scroll the page with a script in `<head>`, it won't work.
 ```
 
 Regular elements can be scrolled by changing `scrollTop/scrollLeft`.
 
-We can do the same for the page using `document.documentElement.scrollTop/Left` (except Safari, where `document.body.scrollTop/Left` should be used instead).
+We can do the same for the page using `document.documentElement.scrollTop/scrollLeft` (except Safari, where `document.body.scrollTop/Left` should be used instead).
 
-Alternatively, there's a simpler, universal solution: special methods  [window.scrollBy(x,y)](mdn:api/Window/scrollBy) and [window.scrollTo(pageX,pageY)](mdn:api/Window/scrollTo).
+Alternatively, there's a simpler, universal solution: special methods [window.scrollBy(x,y)](mdn:api/Window/scrollBy) and [window.scrollTo(pageX,pageY)](mdn:api/Window/scrollTo).
 
 - The method `scrollBy(x,y)` scrolls the page *relative to its current position*. For instance, `scrollBy(0,10)` scrolls the page `10px` down.
 
@@ -106,28 +106,28 @@ These methods work for all browsers the same way.
 
 ## scrollIntoView
 
-For completeness, let's cover one more method:  [elem.scrollIntoView(top)](mdn:api/Element/scrollIntoView).
+For completeness, let's cover one more method: [elem.scrollIntoView(top)](mdn:api/Element/scrollIntoView).
 
 The call to `elem.scrollIntoView(top)` scrolls the page to make `elem` visible. It has one argument:
 
-- if `top=true` (that's the default), then the page will be scrolled to make `elem` appear on the top of the window. The upper edge of the element is aligned with the window top.
-- if `top=false`, then the page scrolls to make `elem` appear at the bottom. The bottom edge of the element is aligned with the window bottom.
+- If `top=true` (that's the default), then the page will be scrolled to make `elem` appear on the top of the window. The upper edge of the element will be aligned with the window top.
+- If `top=false`, then the page scrolls to make `elem` appear at the bottom. The bottom edge of the element will be aligned with the window bottom.
 
 ```online
-The button below scrolls the page to make itself show at the window top:
+The button below scrolls the page to position itself at the window top:
 
 <button onclick="this.scrollIntoView()">this.scrollIntoView()</button>
 
-And this button scrolls the page to show it at the bottom:
+And this button scrolls the page to position itself at the bottom:
 
 <button onclick="this.scrollIntoView(false)">this.scrollIntoView(false)</button>
 ```
 
 ## Forbid the scrolling
 
-Sometimes we need to make the document "unscrollable". For instance, when we need to cover it with a large message requiring immediate attention, and we want the visitor to interact with that message, not with the document.
+Sometimes we need to make the document "unscrollable". For instance, when we need to cover the page with a large message requiring immediate attention, and we want the visitor to interact with that message, not with the document.
 
-To make the document unscrollable, it's enough to set `document.body.style.overflow = "hidden"`. The page will freeze on its current scroll.
+To make the document unscrollable, it's enough to set `document.body.style.overflow = "hidden"`. The page will "freeze" at its current scroll position.
 
 ```online
 Try it:
@@ -136,20 +136,20 @@ Try it:
 
 <button onclick="document.body.style.overflow = ''">document.body.style.overflow = ''</button>
 
-The first button freezes the scroll, the second one resumes it.
+The first button freezes the scroll, while the second one releases it.
 ```
 
-We can use the same technique to "freeze" the scroll for other elements, not just for `document.body`.
+We can use the same technique to freeze the scroll for other elements, not just for `document.body`.
 
-The drawback of the method is that the scrollbar disappears. If it occupied some space, then that space is now free, and the content "jumps" to fill it.
+The drawback of the method is that the scrollbar disappears. If it occupied some space, then that space is now free and the content "jumps" to fill it.
 
-That looks a bit odd, but can be worked around if we compare `clientWidth` before and after the freeze, and if it increased (the scrollbar disappeared) then add `padding` to `document.body` in place of the scrollbar, to keep the content width the same.
+That looks a bit odd, but can be worked around if we compare `clientWidth` before and after the freeze. If it increased (the scrollbar disappeared), then add `padding` to `document.body` in place of the scrollbar to keep the content width the same.
 
 ## Summary
 
 Geometry:
 
-- Width/height of the visible part of the document (content area width/height): `document.documentElement.clientWidth/Height`
+- Width/height of the visible part of the document (content area width/height): `document.documentElement.clientWidth/clientHeight`
 - Width/height of the whole document, with the scrolled out part:
 
     ```js
diff --git a/2-ui/1-document/11-coordinates/article.md b/2-ui/1-document/11-coordinates/article.md
index fb55edf57..4775ff0eb 100644
--- a/2-ui/1-document/11-coordinates/article.md
+++ b/2-ui/1-document/11-coordinates/article.md
@@ -88,8 +88,8 @@ As you can see, `left/top` do not equal `x/y` in such case.
 In practice though, `elem.getBoundingClientRect()` always returns positive width/height, here we mention negative `width/height` only for you to understand why these seemingly duplicate properties are not actually duplicates.
 ```
 
-```warn header="Internet Explorer and Edge: no support for `x/y`"
-Internet Explorer and Edge don't support `x/y` properties for historical reasons.
+```warn header="Internet Explorer: no support for `x/y`"
+Internet Explorer doesn't support `x/y` properties for historical reasons.
 
 So we can either make a polyfill (add getters in `DomRect.prototype`) or just use `top/left`, as they are always the same as `x/y` for positive `width/height`, in particular in the result of `elem.getBoundingClientRect()`.
 ```
diff --git a/2-ui/2-events/01-introduction-browser-events/article.md b/2-ui/2-events/01-introduction-browser-events/article.md
index cf16c9836..19394e49e 100644
--- a/2-ui/2-events/01-introduction-browser-events/article.md
+++ b/2-ui/2-events/01-introduction-browser-events/article.md
@@ -236,7 +236,7 @@ element.removeEventListener(event, handler, [options]);
 ````warn header="Removal requires the same function"
 To remove a handler we should pass exactly the same function as was assigned.
 
-That doesn't work:
+This doesn't work:
 
 ```js no-beautify
 elem.addEventListener( "click" , () => alert('Thanks!'));
diff --git a/2-ui/2-events/02-bubbling-and-capturing/article.md b/2-ui/2-events/02-bubbling-and-capturing/article.md
index decc25154..5d854a59f 100644
--- a/2-ui/2-events/02-bubbling-and-capturing/article.md
+++ b/2-ui/2-events/02-bubbling-and-capturing/article.md
@@ -206,7 +206,7 @@ When an event happens -- the most nested element where it happens gets labeled a
 
 - Then the event moves down from the document root to `event.target`, calling handlers assigned with `addEventListener(..., true)` on the way (`true` is a shorthand for `{capture: true}`).
 - Then handlers are called on the target element itself.
-- Then the event bubbles up from `event.target` up to the root, calling handlers assigned using `on<event>` and `addEventListener` without the 3rd argument or with the 3rd argument `false/{capture:false}`.
+- Then the event bubbles up from `event.target` to the root, calling handlers assigned using `on<event>`, HTML attributes and `addEventListener` without the 3rd argument or with the 3rd argument `false/{capture:false}`.
 
 Each handler can access `event` object properties:
 
@@ -220,6 +220,6 @@ The capturing phase is used very rarely, usually we handle events on bubbling. A
 
 In real world, when an accident happens, local authorities react first. They know best the area where it happened. Then higher-level authorities if needed.
 
-The same for event handlers. The code that set the handler on a particular element knows maximum  details about the element and what it does. A handler on a particular `<td>` may be suited for that exactly `<td>`, it knows everything about it, so it should get the chance first. Then its immediate parent also knows about the context, but a little bit less, and so on till the very top element that handles general concepts and runs the last.
+The same for event handlers. The code that set the handler on a particular element knows maximum details about the element and what it does. A handler on a particular `<td>` may be suited for that exactly `<td>`, it knows everything about it, so it should get the chance first. Then its immediate parent also knows about the context, but a little bit less, and so on till the very top element that handles general concepts and runs the last one.
 
 Bubbling and capturing lay the foundation for "event delegation" -- an extremely powerful event handling pattern that we study in the next chapter.
diff --git a/2-ui/2-events/03-event-delegation/article.md b/2-ui/2-events/03-event-delegation/article.md
index df086f24b..41df9f079 100644
--- a/2-ui/2-events/03-event-delegation/article.md
+++ b/2-ui/2-events/03-event-delegation/article.md
@@ -5,7 +5,7 @@ Capturing and bubbling allow us to implement one of most powerful event handling
 
 The idea is that if we have a lot of elements handled in a similar way, then instead of assigning a handler to each of them -- we put a single handler on their common ancestor.
 
-In the handler we get `event.target`, see where the event actually happened and handle it.
+In the handler we get `event.target` to see where the event actually happened and handle it.
 
 Let's see an example -- the [Ba-Gua diagram](http://en.wikipedia.org/wiki/Ba_gua) reflecting the ancient Chinese philosophy.
 
diff --git a/2-ui/2-events/05-dispatch-events/article.md b/2-ui/2-events/05-dispatch-events/article.md
index 1a8e92ef1..fa6a0308b 100644
--- a/2-ui/2-events/05-dispatch-events/article.md
+++ b/2-ui/2-events/05-dispatch-events/article.md
@@ -162,7 +162,7 @@ Besides, the event class describes "what kind of event" it is, and if the event
 
 ## event.preventDefault()
 
-Many browser events have a "default action", such as nagivating to a link, starting a selection, and so on.
+Many browser events have a "default action", such as navigating to a link, starting a selection, and so on.
 
 For new, custom events, there are definitely no default browser actions, but a code that dispatches such event may have its own plans what to do after triggering the event.
 
@@ -187,7 +187,6 @@ Any handler can listen for that event with `rabbit.addEventListener('hide',...)`
 <button onclick="hide()">Hide()</button>
 
 <script>
-  // hide() will be called automatically in 2 seconds
   function hide() {
     let event = new CustomEvent("hide", {
       cancelable: true // without that flag preventDefault doesn't work
@@ -211,13 +210,13 @@ Please note: the event must have the flag `cancelable: true`, otherwise the call
 
 ## Events-in-events are synchronous
 
-Usually events are processed in a queue. That is: if the browser is processing `onclick` and a new event occurs, e.g. mouse moved, then it's handing is queued up, corresponding `mousemove` handlers will be called after `onclick` processing is finished.
+Usually events are processed in a queue. That is: if the browser is processing `onclick` and a new event occurs, e.g. mouse moved, then it's handling is queued up, corresponding `mousemove` handlers will be called after `onclick` processing is finished.
 
 The notable exception is when one event is initiated from within another one, e.g. using `dispatchEvent`. Such events are processed immediately: the new event handlers are called, and then the current event handling is resumed.
 
 For instance, in the code below the `menu-open` event is triggered during the `onclick`.
 
-It's processed immediately, without waiting for `onlick` handler to end:
+It's processed immediately, without waiting for `onclick` handler to end:
 
 
 ```html run autorun
@@ -243,7 +242,7 @@ The output order is: 1 -> nested -> 2.
 
 Please note that the nested event `menu-open` is caught on the `document`. The propagation and handling of the nested event is finished before the processing gets back to the outer code (`onclick`).
 
-That's not only about `dispatchEvent`, there are other cases. If an event handler calls methods that trigger to other events -- they are too processed synchronously, in a nested fashion.
+That's not only about `dispatchEvent`, there are other cases. If an event handler calls methods that trigger other events -- they are processed synchronously too, in a nested fashion.
 
 Let's say we don't like it. We'd want `onclick` to be fully processed first, independently from `menu-open` or any other nested events.
 
@@ -283,9 +282,9 @@ Other constructors of native events like `MouseEvent`, `KeyboardEvent` and so on
 
 For custom events we should use `CustomEvent` constructor. It has an additional option named `detail`, we should assign the event-specific data to it. Then all handlers can access it as `event.detail`.
 
-Despite the technical possibility to generate browser events like `click` or `keydown`, we should use with the great care.
+Despite the technical possibility of generating browser events like `click` or `keydown`, we should use them with great care.
 
-We shouldn't generate browser events as it's a hacky way to run handlers. That's a bad architecture most of the time.
+We shouldn't generate browser events as it's a hacky way to run handlers. That's bad architecture most of the time.
 
 Native events might be generated:
 
diff --git a/2-ui/3-event-details/1-mouse-events-basics/article.md b/2-ui/3-event-details/1-mouse-events-basics/article.md
index 551bc564a..651c3273f 100644
--- a/2-ui/3-event-details/1-mouse-events-basics/article.md
+++ b/2-ui/3-event-details/1-mouse-events-basics/article.md
@@ -24,7 +24,7 @@ We've already seen some of these events:
 : Triggers after two clicks on the same element within a short timeframe. Rarely used nowadays.
 
 `contextmenu`
-: Triggers when when the right mouse button is pressed. There are other ways to open a context menu, e.g. using a special keyboard key, it triggers in that case also, so it's not exactly the mouse event.
+: Triggers when the right mouse button is pressed. There are other ways to open a context menu, e.g. using a special keyboard key, it triggers in that case also, so it's not exactly the mouse event.
 
 ...There are several other events too, we'll cover them later.
 
@@ -34,7 +34,7 @@ As you can see from the list above, a user action may trigger multiple events.
 
 For instance, a left-button click first triggers `mousedown`, when the button is pressed, then `mouseup` and `click` when it's released.
 
-In cases when a single action initiates multiple events, their order is fixed. That is, the handlers are called in the order `mousedown` -> `mouseup` -> `click`. 
+In cases when a single action initiates multiple events, their order is fixed. That is, the handlers are called in the order `mousedown` -> `mouseup` -> `click`.
 
 ```online
 Click the button below and you'll see the events. Try double-click too.
@@ -50,7 +50,7 @@ Also we can see the `button` property that allows to detect the mouse button, it
 
 Click-related events always have the `button` property, which allows to get the exact mouse button.
 
-We usually don't use it for `click` and `contextmenu` events, because the former happens only on left-click, and the latter -- only on right-click. 
+We usually don't use it for `click` and `contextmenu` events, because the former happens only on left-click, and the latter -- only on right-click.
 
 From the other hand, `mousedown` and `mouseup` handlers we may need `event.button`, because these events trigger on any button, so `button` allows to distinguish between "right-mousedown" and "left-mousedown".
 
@@ -59,14 +59,14 @@ The possible values of `event.button` are:
 | Button state | `event.button` |
 |--------------|----------------|
 | Left button (primary) | 0 |
-| Middle button (auxillary) | 1 |
+| Middle button (auxiliary) | 1 |
 | Right button (secondary) | 2 |
 | X1 button (back) | 3 |
 | X2 button (forward) | 4 |
 
 Most mouse devices only have the left and right buttons, so possible values are `0` or `2`. Touch devices also generate similar events when one taps on them.
 
-Also there's `event.buttons` property that has all currently pressed buttons as an integer, one bit per button. In practice this property is very rarely used, you can find details at [MDN](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons) if you ever need it.
+Also there's `event.buttons` property that has all currently pressed buttons as an integer, one bit per button. In practice this property is very rarely used, you can find details at [MDN](mdn:/api/MouseEvent/buttons) if you ever need it.
 
 ```warn header="The outdated `event.which`"
 Old code may use `event.which` property that's an old non-standard way of getting a button, with possible values:
@@ -156,7 +156,7 @@ Move the mouse over the input field to see `clientX/clientY` (the example is in
 
 Double mouse click has a side-effect that may be disturbing in some interfaces: it selects text.
 
-For instance, a double-click on the text below selects it in addition to our handler:
+For instance, double-clicking on the text below selects it in addition to our handler:
 
 ```html autorun height=50
 <span ondblclick="alert('dblclick')">Double-click me</span>
diff --git a/2-ui/3-event-details/4-mouse-drag-and-drop/article.md b/2-ui/3-event-details/4-mouse-drag-and-drop/article.md
index a47bfade6..6cb1152c1 100644
--- a/2-ui/3-event-details/4-mouse-drag-and-drop/article.md
+++ b/2-ui/3-event-details/4-mouse-drag-and-drop/article.md
@@ -276,7 +276,7 @@ function onMouseMove(event) {
 }
 ```
 
-In the example below when the ball is dragged over the soccer gate, the gate is highlighted.
+In the example below when the ball is dragged over the soccer goal, the goal is highlighted.
 
 [codetabs height=250 src="ball4"]
 
@@ -300,4 +300,4 @@ We can lay a lot on this foundation.
 - We can use event delegation for `mousedown/up`. A large-area event handler that checks  `event.target` can manage Drag'n'Drop for hundreds of elements.
 - And so on.
 
-There are frameworks that build architecture over it: `DragZone`, `Droppable`, `Draggable` and other classes. Most of them do the similar stuff to what's described above, so it should be easy to understand them now. Or roll your own, as you can see that that's easy enough to do, sometimes easier than adapting a third-part solution.
+There are frameworks that build architecture over it: `DragZone`, `Droppable`, `Draggable` and other classes. Most of them do the similar stuff to what's described above, so it should be easy to understand them now. Or roll your own, as you can see that that's easy enough to do, sometimes easier than adapting a third-party solution.
diff --git a/2-ui/3-event-details/4-mouse-drag-and-drop/ball.view/index.html b/2-ui/3-event-details/4-mouse-drag-and-drop/ball.view/index.html
index 36219e303..8751c70ad 100644
--- a/2-ui/3-event-details/4-mouse-drag-and-drop/ball.view/index.html
+++ b/2-ui/3-event-details/4-mouse-drag-and-drop/ball.view/index.html
@@ -13,7 +13,7 @@
 
 
   <script>
-    ball.onmousedown = function(event) { 
+    ball.onmousedown = function(event) {
       ball.style.position = 'absolute';
       ball.style.zIndex = 1000;
       document.body.appendChild(ball);
diff --git a/2-ui/3-event-details/6-pointer-events/article.md b/2-ui/3-event-details/6-pointer-events/article.md
index 7c4d0a066..3e751a4af 100644
--- a/2-ui/3-event-details/6-pointer-events/article.md
+++ b/2-ui/3-event-details/6-pointer-events/article.md
@@ -1,30 +1,36 @@
 # Pointer events
 
-Pointer events is a modern way to handle input from a variety of pointing devices, such as a mouse, a pen/stylus, a touchscreen and so on.
+Pointer events are a modern way to handle input from a variety of pointing devices, such as a mouse, a pen/stylus, a touchscreen, and so on.
 
 ## The brief history
 
 Let's make a small overview, so that you understand the general picture and the place of Pointer Events among other event types.
 
-- Long ago, in the past, there existed only mouse events.
+- Long ago, in the past, there were only mouse events.
 
-    Then touch devices appeared. For the old code to work, they also generate mouse events. For instance, tapping generates `mousedown`. But mouse events were not good enough, as touch devices are more powerful in many aspects. For example, it's possible to touch multiple points at once, and mouse events don't have any properties for that.
+    Then touch devices became widespread, phones and tablets in particular. For the existing scripts to work, they generated (and still generate) mouse events. For instance, tapping a touchscreen generates `mousedown`. So touch devices worked well with web pages.
+    
+    But touch devices have more capabilities than a mouse. For example, it's possible to touch multiple points at once ("multi-touch"). Although, mouse events don't have necessary properties to handle such multi-touches.
 
 - So touch events were introduced, such as `touchstart`, `touchend`, `touchmove`, that have touch-specific properties (we don't cover them in detail here, because pointer events are even better).
 
-    Still, it wasn't enough, as there are many other devices, such as pens, that have their own features. Also, writing a code that listens both touch and mouse events was cumbersome. 
+    Still, it wasn't enough, as there are many other devices, such as pens, that have their own features. Also, writing code that listens for both touch and mouse events was cumbersome. 
 
 - To solve these issues, the new standard Pointer Events was introduced. It provides a single set of events for all kinds of pointing devices.
 
-As of now, [Pointer Events Level 2](https://www.w3.org/TR/pointerevents2/) specification is supported in all major browsers, while the [Pointer Events Level 3](https://w3c.github.io/pointerevents/) is in the works. Unless you code for Internet Explorer 10 or Safari 12 and below, there's no point in using mouse or touch events any more. We can switch to pointer events.
+As of now, [Pointer Events Level 2](https://www.w3.org/TR/pointerevents2/) specification is supported in all major browsers, while the newer [Pointer Events Level 3](https://w3c.github.io/pointerevents/) is in the works and is mostly compartible with Pointer Events level 2. 
+
+Unless you develop for old browsers, such as Internet Explorer 10, or for Safari 12 or below, there's no point in using mouse or touch events any more -- we can switch to pointer events.
 
-That said, there are important peculiarities, one should know them to use them correctly and avoid extra surprises.  We'll pay attention to them in this article.
+Then your code will work well with both touch and mouse devices.
+
+That said, there are some important peculiarities that one should know in order to use Pointer Events correctly and avoid surprises. We'll make note of them in this article.
 
 ## Pointer event types
 
-Pointer events are named similar to mouse events:
+Pointer events are named similarly to mouse events:
 
-| Pointer Event | Mouse event |
+| Pointer event | Similar mouse event |
 |---------------|-------------|
 | `pointerdown` | `mousedown` |
 | `pointerup` | `mouseup` |
@@ -37,71 +43,69 @@ Pointer events are named similar to mouse events:
 | `gotpointercapture` | - |
 | `lostpointercapture` | - |
 
-As we can see, for every `mouse<event>`, there's a `pointer<event>` that plays a similar role. Also there are 3 additional pointer events that don't have a corresponding `mouse...` counterpart, we'll soon explain about them. 
+As we can see, for every `mouse<event>`, there's a `pointer<event>` that plays a similar role. Also there are 3 additional pointer events that don't have a corresponding `mouse...` counterpart, we'll explain them soon. 
 
 ```smart header="Replacing `mouse<event>` with `pointer<event>` in our code"
 We can replace `mouse<event>` events with `pointer<event>` in our code and expect things to continue working fine with mouse.
 
-The support for touch devices will also "magically" improve, but we'll probably need to add `touch-action: none` rule in CSS. See the details below in the section about `pointercancel`. 
+The support for touch devices will also "magically" improve. Although, we may need to add `touch-action: none` in some places in CSS. We'll cover it below in the section about `pointercancel`. 
 ```
 
 ## Pointer event properties
 
-Pointer events have the same properties as mouse events, such as `clientX/Y`, `target` etc, plus some extra:
+Pointer events have the same properties as mouse events, such as `clientX/Y`, `target`, etc., plus some others:
 
 - `pointerId` - the unique identifier of the pointer causing the event.
     
-    Allows to handle multiple pointers, such as a touchscreen with stylus and multi-touch (explained below).
-- `pointerType` - the pointing device type, must be a string, one of: "mouse", "pen" or "touch". 
+    Browser-generated. Allows us to handle multiple pointers, such as a touchscreen with stylus and multi-touch (examples will follow).
+- `pointerType` - the pointing device type. Must be a string, one of: "mouse", "pen" or "touch". 
 
     We can use this property to react differently on various pointer types.
-- `isPrimary` - `true` for the primary pointer (the first finger in multi-touch).
+- `isPrimary` - is `true` for the primary pointer (the first finger in multi-touch).
 
-For pointers that measure a contact area and pressure, e.g. a finger on the touchscreen, the additional properties can be useful:
+Some pointer devices measure contact area and pressure, e.g. for a finger on the touchscreen, there are additional properties for that:
 
-- `width` - the width of of the area where the pointer touches the device. Where unsupported, e.g. for mouse it's always `1`. 
-- `height` - the height of of the area where the pointer touches the device. Where unsupported, always `1`.
+- `width` - the width of the area where the pointer (e.g. a finger) touches the device. Where unsupported, e.g. for a mouse, it's always `1`. 
+- `height` - the height of the area where the pointer touches the device. Where unsupported, it's always `1`.
 - `pressure` - the pressure of the pointer tip, in range from 0 to 1. For devices that don't support pressure must be either `0.5` (pressed) or `0`.
 - `tangentialPressure` - the normalized tangential pressure.
 - `tiltX`, `tiltY`, `twist` - pen-specific properties that describe how the pen is positioned relative the surface.
 
-These properties aren't very well supported across devices, so they are rarely used. You can find the details in the [specification](https://w3c.github.io/pointerevents/#pointerevent-interface) if needed.
+These properties aren't supported by most devices, so they are rarely used. You can find the details about them in the [specification](https://w3c.github.io/pointerevents/#pointerevent-interface) if needed.
 
 ## Multi-touch
 
-One of the things that mouse events totally don't support is multi-touch: a user can touch them in several places at once at their phone or tablet, perform special gestures.
+One of the things that mouse events totally don't support is multi-touch: a user can touch in several places at once on their phone or tablet, or perform special gestures.
 
-Pointer Events allow to handle multi-touch with the help of `pointerId` and `isPrimary` properties.
+Pointer Events allow handling multi-touch with the help of the `pointerId` and `isPrimary` properties.
 
-Here's what happens when a user touches a screen at one place, and then puts another finger somewhere else on it:
+Here's what happens when a user touches a touchscreen in one place, then puts another finger somewhere else on it:
 
-1. At the first touch:
+1. At the first finger touch:
     - `pointerdown` with `isPrimary=true` and some `pointerId`.
-2. For the second finger and further touches:
+2. For the second finger and more fingers (assuming the first one is still touching):
     - `pointerdown` with `isPrimary=false` and a different `pointerId` for every finger.
 
-Please note: there `pointerId` is assigned not to the whole device, but for each touching finger. If we use 5 fingers to simultaneously touch the screen, we have 5 `pointerdown` events with respective coordinates and different `pointerId`.
+Please note: the `pointerId` is assigned not to the whole device, but for each touching finger. If we use 5 fingers to simultaneously touch the screen, we have 5 `pointerdown` events, each with their respective coordinates and a different `pointerId`.
 
 The events associated with the first finger always have `isPrimary=true`.
 
-We can track multiple touching fingers using their `pointerId`. When the user moves move and then detouches a finger, we get `pointermove` and `pointerup` events with the same `pointerId` as we had in `pointerdown`.
+We can track multiple touching fingers using their `pointerId`. When the user moves and then removes a finger, we get `pointermove` and `pointerup` events with the same `pointerId` as we had in `pointerdown`.
 
 ```online
 Here's the demo that logs `pointerdown` and `pointerup` events:
 
 [iframe src="multitouch" edit height=200]
 
-Please note: you must be using a touchscreen device, such as a phone or a tablet to actually see the difference. For single-touch devices, such as a mouse, there'll be always same `pointerId` with `isPrimary=true`, for all pointer events.
+Please note: you must be using a touchscreen device, such as a phone or a tablet, to actually see the difference in `pointerId/isPrimary`. For single-touch devices, such as a mouse, there'll be always same `pointerId` with `isPrimary=true`, for all pointer events.
 ```
 
 ## Event: pointercancel
 
-We've mentioned the importance of `touch-action: none` before. Now let's explain why, as skipping this may cause our interfaces to malfunction.
-
 The `pointercancel` event fires when there's an ongoing pointer interaction, and then something happens that causes it to be aborted, so that no more pointer events are generated. 
 
 Such causes are: 
-- The pointer device hardware was disabled.
+- The pointer device hardware was physically disabled.
 - The device orientation changed (tablet rotated). 
 - The browser decided to handle the interaction on its own, considering it a mouse gesture or zoom-and-pan action or something else.
 
@@ -109,38 +113,38 @@ We'll demonstrate `pointercancel` on a practical example to see how it affects u
 
 Let's say we're impelementing drag'n'drop for a ball, just as in the beginning of the article <info:mouse-drag-and-drop>.
 
-Here are the flow of user actions and corresponding events:
+Here is the flow of user actions and the corresponding events:
 
-1) The user presses the mouse button on an image, to start dragging
+1) The user presses on an image, to start dragging
     - `pointerdown` event fires
-2) Then they start dragging the image
+2) Then they start moving the pointer (thus dragging the image)
     - `pointermove` fires, maybe several times
-3) Surprise! The browser has native drag'n'drop support for images, that kicks in and takes over the drag'n'drop process, thus generating `pointercancel` event.
+3) And then the surprise happens! The browser has native drag'n'drop support for images, that kicks in and takes over the drag'n'drop process, thus generating `pointercancel` event.
     - The browser now handles drag'n'drop of the image on its own. The user may even drag the ball image out of the browser, into their Mail program or a File Manager.
     - No more `pointermove` events for us.
 
-So the issue is that the browser "hijacks" the interaction: `pointercancel` fires and no more `pointermove` events are generated.
+So the issue is that the browser "hijacks" the interaction: `pointercancel` fires in the beginning of the "drag-and-drop" process, and no more `pointermove` events are generated.
 
 ```online
-Here's the demo with pointer events (only `up/down`, `move` and `cancel`) logged in the textarea: 
+Here's the drag'n'drop demo with loggin of pointer events (only `up/down`, `move` and `cancel`) in the `textarea`: 
 
 [iframe src="ball" height=240 edit]
 ```
 
-We'd like to implement our own drag'n'drop, so let's tell the browser not to take it over.
+We'd like to implement the drag'n'drop on our own, so let's tell the browser not to take it over.
 
-**Prevent default browser actions to avoid `pointercancel`.**
+**Prevent the default browser action to avoid `pointercancel`.**
 
 We need to do two things:
 
 1. Prevent native drag'n'drop from happening:
-    - Can do it by setting `ball.ondragstart = () => false`, just as described in the article <info:mouse-drag-and-drop>.
+    - We can do this by setting `ball.ondragstart = () => false`, just as described in the article <info:mouse-drag-and-drop>.
     - That works well for mouse events.
-2. For touch devices, there are also touch-related browser actions. We'll have problems with them too.
-    - We can prevent them by setting `#ball { touch-action: none }` in CSS. 
+2. For touch devices, there are other touch-related browser actions (besides drag'n'drop). To avoid problems with them too:
+    - Prevent them by setting `#ball { touch-action: none }` in CSS. 
     - Then our code will start working on touch devices.
 
-After we do that, the events will work as intended, the browser won't hijack the process and emit no `pointercancel`.
+After we do that, the events will work as intended, the browser won't hijack the process and doesn't emit `pointercancel`.
 
 ```online
 This demo adds these lines:
@@ -156,41 +160,52 @@ Now we can add the code to actually move the ball, and our drag'n'drop will work
 
 Pointer capturing is a special feature of pointer events.
 
-The idea is that we can "bind" all events with a particular `pointerId` to a given element. Then all subsequent events with the same `pointerId` will be retargeted to the same element. That is: the browser sets that element as the target and trigger associated handlers, no matter where it actually happened.
+The idea is very simple, but may seem quite odd at first, as nothing like that exists for any other event type.
 
-The related methods are:
-- `elem.setPointerCapture(pointerId)` - binds the given `pointerId` to `elem`.
-- `elem.releasePointerCapture(pointerId)` - unbinds the given `pointerId` from `elem`.
+The main method is:
+- `elem.setPointerCapture(pointerId)` - binds events with the given `pointerId` to `elem`. After the call all pointer events with the same `pointerId` will have `elem` as the target (as if happened on `elem`), no matter where in document they really happened.
 
-Such binding doesn't hold long. It's automatically removed after `pointerup` or `pointercancel` events, or when the target `elem` is removed from the document. 
+In other words, `elem.setPointerCapture(pointerId)` retargets all subsequent events with the given `pointerId` to `elem`.
 
-Now when do we need this?
+The binding is removed:
+- automatically when `pointerup` or `pointercancel` events occur,
+- automatically when `elem` is removed from the document,
+- when `elem.releasePointerCapture(pointerId)` is called.
 
-**Pointer capturing is used to simplify drag'n'drop kind of interactions.**
+**Pointer capturing can be used to simplify drag'n'drop kind of interactions.**
 
-Let's recall the problem we met while making a custom slider in the article <info:mouse-drag-and-drop>.
+As an example, let's recall how one can implement a custom slider, described in the <info:mouse-drag-and-drop>.
 
-1) First, the user presses `pointerdown` on the slider thumb to start dragging it.
-2) ...But then, as they move the pointer, it may leave the slider: go below or over it.
+We make a slider element with the strip and the "runner" (`thumb`) inside it.
 
-But we continue tracking track `pointermove` events and move the thumb until `pointerup`, even though the pointer is not on the slider any more.
+Then it works like this:
 
-[Previously](info:mouse-drag-and-drop), to handle `pointermove` events that happen outside of the slider, we listened for `pointermove` events on the whole `document`. 
+1. The user presses on the slider `thumb` - `pointerdown` triggers.
+2. Then they move the pointer - `pointermove` triggers, and we move the `thumb` along.
+    - ...As the pointer moves, it may leave the slider `thumb`: go above or below it. The `thumb` should move strictly horizontally, remaining aligned with the pointer.
 
-Pointer capturing provides an alternative solution: we can call `thumb.setPointerCapture(event.pointerId)` in `pointerdown` handler, and then all future pointer events until `pointerup` will be retargeted to `thumb`.
+So, to track all pointer movements, including when it goes above/below the `thumb`, we had to assign `pointermove` event handler on the whole `document`.
 
-That is: events handlers on `thumb` will be called, and `event.target` will always be `thumb`, even if the user moves their pointer around the whole document. So we can listen at `thumb` for `pointermove`, no matter where it happens.
+That solution looks a bit "dirty". One of the problems is that pointer movements around the document may cause side effects, trigger other event handlers, totally not related to the slider.
+
+Pointer capturing provides a means to bind `pointermove` to `thumb` and avoid any such problems:
+
+- We can call `thumb.setPointerCapture(event.pointerId)` in `pointerdown` handler,
+- Then future pointer events until `pointerup/cancel` will be retargeted to `thumb`. 
+- When `pointerup` happens (dragging complete), the binding is removed automatically, we don't need to care about it.
+
+So, even if the user moves the pointer around the whole document, events handlers will be called on `thumb`. Besides, coordinate properties of the event objects, such as `clientX/clientY` will still be correct - the capturing only affects `target/currentTarget`.
 
 Here's the essential code:
 
 ```js
 thumb.onpointerdown = function(event) {
-  // retarget all pointer events (until pointerup) to me
+  // retarget all pointer events (until pointerup) to thumb
   thumb.setPointerCapture(event.pointerId);
 };
 
 thumb.onpointermove = function(event) {
-  // move the slider: listen at thumb, as all events are retargeted to it
+  // moving the slider: listen on the thumb, as all pointer events are retargeted to it
   let newLeft = event.clientX - slider.getBoundingClientRect().left;
   thumb.style.left = newLeft + 'px';
 };
@@ -205,7 +220,11 @@ The full demo:
 [iframe src="slider" height=100 edit]
 ```
 
-**As a summary: the code becomes cleaner as we don't need to add/remove handlers on the whole `document` any more. That's what pointer capturing does.**
+At the end, pointer capturing gives us two benefits:
+1. The code becomes cleaner as we don't need to add/remove handlers on the whole `document` any more. The binding is released automatically.
+2. If there are any `pointermove` handlers in the document, they won't be accidentally triggered by the pointer while the user is dragging the slider.
+
+### Pointer capturing events
 
 There are two associated pointer events:
 
@@ -214,16 +233,16 @@ There are two associated pointer events:
 
 ## Summary
 
-Pointer events allow to handle mouse, touch and pen events simultaneously.
+Pointer events allow handling mouse, touch and pen events simultaneously, with a single piece of code.
 
 Pointer events extend mouse events. We can replace `mouse` with `pointer` in event names and expect our code to continue working for mouse, with better support for other device types.
 
-Remember to set `touch-events: none` in CSS for elements that we engage, otherwise the browser hijacks many types of touch interactions and pointer events won't be generated.
+For drag'n'drops and complex touch interactions that the browser may decide to hijack and handle on its own - remember to cancel the default action on events and set `touch-events: none` in CSS for elements that we engage.
 
-Additional abilities of Pointer events are:
+Additional abilities of pointer events are:
 
 - Multi-touch support using `pointerId` and `isPrimary`.
-- Device-specific properties, such as `pressure`, `width/height` and others.
+- Device-specific properties, such as `pressure`, `width/height`, and others.
 - Pointer capturing: we can retarget all pointer events to a specific element until `pointerup`/`pointercancel`.
 
-As of now, pointer events are supported in all major browsers, so we can safely switch to them, if IE10- and Safari 12- are not needed. And even with those browsers, there are polyfills that enable the support of pointer events.
+As of now, pointer events are supported in all major browsers, so we can safely switch to them, especially if IE10- and Safari 12- are not needed. And even with those browsers, there are polyfills that enable the support of pointer events.
diff --git a/2-ui/3-event-details/8-onscroll/1-endless-page/solution.md b/2-ui/3-event-details/8-onscroll/1-endless-page/solution.md
index 10945ccd7..54c101193 100644
--- a/2-ui/3-event-details/8-onscroll/1-endless-page/solution.md
+++ b/2-ui/3-event-details/8-onscroll/1-endless-page/solution.md
@@ -55,11 +55,11 @@ function populate() {
     // document bottom
     let windowRelativeBottom = document.documentElement.getBoundingClientRect().bottom;
 
-    // if the user scrolled far enough (<100px to the end)
-    if (windowRelativeBottom < document.documentElement.clientHeight + 100) {
-      // let's add more data
-      document.body.insertAdjacentHTML("beforeend", `<p>Date: ${new Date()}</p>`);
-    }
+    // if the user hasn't scrolled far enough (>100px to the end)
+    if (windowRelativeBottom > document.documentElement.clientHeight + 100) break;
+    
+    // let's add more data
+    document.body.insertAdjacentHTML("beforeend", `<p>Date: ${new Date()}</p>`);
   }
 }
 ```
diff --git a/2-ui/3-event-details/8-onscroll/article.md b/2-ui/3-event-details/8-onscroll/article.md
index 7b5cf4848..734bd84c6 100644
--- a/2-ui/3-event-details/8-onscroll/article.md
+++ b/2-ui/3-event-details/8-onscroll/article.md
@@ -1,6 +1,6 @@
 # Scrolling
 
-The `scroll` event allows to react on a page or element scrolling. There are quite a few good things we can do here.
+The `scroll` event allows reacting to a page or element scrolling. There are quite a few good things we can do here.
 
 For instance:
 - Show/hide additional controls or information depending on where in the document the user is.
@@ -34,4 +34,4 @@ If we add an event handler to these events and `event.preventDefault()` in it, t
 
 There are many ways to initiate a scroll, so it's more reliable to use CSS, `overflow` property.
 
-Here are few tasks that you can solve or look through to see the applications on `onscroll`.
+Here are few tasks that you can solve or look through to see applications of `onscroll`.
diff --git a/2-ui/4-forms-controls/1-form-elements/article.md b/2-ui/4-forms-controls/1-form-elements/article.md
index 01af1f400..1c6188b5b 100644
--- a/2-ui/4-forms-controls/1-form-elements/article.md
+++ b/2-ui/4-forms-controls/1-form-elements/article.md
@@ -205,7 +205,9 @@ Here is an example:
 </script>
 ```
 
-Unlike most other controls, `<select>` allows to select multiple options at once if it has `multiple` attribute. That's feature is rarely used. In that case we need to use the first way: add/remove the `selected` property from `<option>` subelements.
+Unlike most other controls, `<select>` allows to select multiple options at once if it has `multiple` attribute. Although such functionality is available, it is rarely used. 
+
+In cases that you have to, then use the first way: add/remove the `selected` property from `<option>` subelements.
 
 We can get their collection as `select.options`, for instance:
 
diff --git a/2-ui/4-forms-controls/2-focus-blur/article.md b/2-ui/4-forms-controls/2-focus-blur/article.md
index d42013e5b..d4348d25b 100644
--- a/2-ui/4-forms-controls/2-focus-blur/article.md
+++ b/2-ui/4-forms-controls/2-focus-blur/article.md
@@ -1,6 +1,6 @@
 # Focusing: focus/blur
 
-An element receives a focus when the user either clicks on it or uses the `key:Tab` key on the keyboard. There's also an `autofocus` HTML attribute that puts the focus into an element by default when a page loads and other means of getting a focus.
+An element receives the focus when the user either clicks on it or uses the `key:Tab` key on the keyboard. There's also an `autofocus` HTML attribute that puts the focus onto an element by default when a page loads and other means of getting the focus.
 
 Focusing on an element generally means: "prepare to accept the data here", so that's the moment when we can run the code to initialize the required functionality.
 
@@ -18,7 +18,7 @@ Let's use them for validation of an input field.
 
 In the example below:
 
-- The `blur` handler checks if the field the email is entered, and if not -- shows an error.
+- The `blur` handler checks if the field has an email entered, and if not -- shows an error.
 - The `focus` handler hides the error message (on `blur` it will be checked again):
 
 ```html run autorun height=60
@@ -108,7 +108,7 @@ By default many elements do not support focusing.
 
 The list varies a bit between browsers, but one thing is always correct: `focus/blur` support is guaranteed for elements that a visitor can interact with: `<button>`, `<input>`, `<select>`, `<a>` and so on.
 
-From the other hand, elements that exist to format something, such as `<div>`, `<span>`, `<table>` -- are unfocusable by default. The method `elem.focus()` doesn't work on them, and `focus/blur` events are never triggered.
+On the other hand, elements that exist to format something, such as `<div>`, `<span>`, `<table>` -- are unfocusable by default. The method `elem.focus()` doesn't work on them, and `focus/blur` events are never triggered.
 
 This can be changed using HTML-attribute `tabindex`.
 
@@ -131,7 +131,7 @@ There are two special values:
 For instance, here's a list. Click the first item and press `key:Tab`:
 
 ```html autorun no-beautify
-Click the first item and press Tab. Keep track of the order. Please note that many subsequent Tabs can move the focus out of the iframe with the example.
+Click the first item and press Tab. Keep track of the order. Please note that many subsequent Tabs can move the focus out of the iframe in the example.
 <ul>
   <li tabindex="1">One</li>
   <li tabindex="0">Zero</li>
@@ -216,7 +216,7 @@ So here's another working variant:
 
 ## Summary
 
-Events `focus` and `blur` trigger on focusing/losing focus on the element.
+Events `focus` and `blur` trigger on an element focusing/losing focus.
 
 Their specials are:
 - They do not bubble. Can use capturing state instead or `focusin/focusout`.
diff --git a/2-ui/4-forms-controls/3-events-change-input/article.md b/2-ui/4-forms-controls/3-events-change-input/article.md
index b43a305b3..1355e8bb6 100644
--- a/2-ui/4-forms-controls/3-events-change-input/article.md
+++ b/2-ui/4-forms-controls/3-events-change-input/article.md
@@ -76,11 +76,13 @@ For instance, the code below prevents all such events and shows what we are tryi
 
 Please note, that it's possible to copy/paste not just text, but everything. For instance, we can copy a file in the OS file manager, and paste it.
 
-There's a list of methods [in the specification](https://www.w3.org/TR/clipboard-apis/#dfn-datatransfer) that can work with different data types including files, read/write to the clipboard.
+That's because `clipboardData` implements `DataTransfer` interface, commonly used for drag'n'drop and copy/pasting. It's bit beyound our scope now, but you can find its methods [in the specification](https://html.spec.whatwg.org/multipage/dnd.html#the-datatransfer-interface).
 
-But please note that clipboard is a "global" OS-level thing. Most browsers allow read/write access to the clipboard only in the scope of certain user actions for the safety, e.g. in `onclick` event handlers.
+```warn header="ClipboardAPI: user safety restrictions"
+The clipboard is a "global" OS-level thing. So most browsers allow read/write access to the clipboard only in the scope of certain user actions for the safety, e.g. in `onclick` event handlers.
 
 Also it's forbidden to generate "custom" clipboard events with `dispatchEvent` in all browsers except Firefox.
+```
 
 ## Summary
 
diff --git a/2-ui/5-loading/01-onload-ondomcontentloaded/article.md b/2-ui/5-loading/01-onload-ondomcontentloaded/article.md
index 3d8b98180..377e7703a 100644
--- a/2-ui/5-loading/01-onload-ondomcontentloaded/article.md
+++ b/2-ui/5-loading/01-onload-ondomcontentloaded/article.md
@@ -2,7 +2,7 @@
 
 The lifecycle of an HTML page has three important events:
 
-- `DOMContentLoaded` -- the browser fully loaded HTML, and the DOM tree is built, but external resources like pictures `<img>` and stylesheets may be not yet loaded.  
+- `DOMContentLoaded` -- the browser fully loaded HTML, and the DOM tree is built, but external resources like pictures `<img>` and stylesheets may not yet have loaded.  
 - `load` -- not only HTML is loaded, but also all the external resources: images, styles etc.
 - `beforeunload/unload` -- the user is leaving the page.
 
@@ -33,7 +33,7 @@ For instance:
   function ready() {
     alert('DOM is ready');
 
-    // image is not yet loaded (unless was cached), so the size is 0x0
+    // image is not yet loaded (unless it was cached), so the size is 0x0
     alert(`Image size: ${img.offsetWidth}x${img.offsetHeight}`);
   }
 
@@ -145,7 +145,7 @@ let analyticsData = { /* object with gathered data */ };
 
 window.addEventListener("unload", function() {
   navigator.sendBeacon("/analytics", JSON.stringify(analyticsData));
-};
+});
 ```
 
 - The request is sent as POST.
@@ -209,7 +209,7 @@ Like this:
 function work() { /*...*/ }
 
 if (document.readyState == 'loading') {
-  // loading yet, wait for the event
+  // still loading, wait for the event
   document.addEventListener('DOMContentLoaded', work);
 } else {
   // DOM is ready!
diff --git a/2-ui/5-loading/02-script-async-defer/article.md b/2-ui/5-loading/02-script-async-defer/article.md
index ca82a7302..2f9d45e9c 100644
--- a/2-ui/5-loading/02-script-async-defer/article.md
+++ b/2-ui/5-loading/02-script-async-defer/article.md
@@ -3,7 +3,7 @@
 
 In modern websites, scripts are often "heavier" than HTML: their download size is larger, and processing time is also longer.
 
-When the browser loads HTML and comes across a `<script>...</script>` tag, it can't continue building the DOM. It must execute the script right now. The same happens for external scripts `<script src="..."></script>`: the browser must wait until the script downloads, execute it, and only after process the rest of the page.
+When the browser loads HTML and comes across a `<script>...</script>` tag, it can't continue building the DOM. It must execute the script right now. The same happens for external scripts `<script src="..."></script>`: the browser must wait for the script to download, execute the downloaded script, and only then can it process the rest of the page.
 
 That leads to two important issues:
 
@@ -37,7 +37,7 @@ Luckily, there are two `<script>` attributes that solve the problem for us: `def
 
 ## defer
 
-The `defer` attribute tells the browser that it should go on working with the page, and load the script "in background", then run the script when it loads.
+The `defer` attribute tells the browser not to wait for the script. Instead, the browser will continue to process the HTML, build DOM. The script loads "in the background", and then runs when the DOM is fully built.
 
 Here's the same example as above, but with `defer`:
 
@@ -50,16 +50,18 @@ Here's the same example as above, but with `defer`:
 <p>...content after script...</p>
 ```
 
+In other words:
+
 - Scripts with `defer` never block the page.
-- Scripts with `defer` always execute when the DOM is ready, but before `DOMContentLoaded` event.
+- Scripts with `defer` always execute when the DOM is ready (but before `DOMContentLoaded` event).
 
-The following example demonstrates that:
+The following example demonstrates the second part:
 
 ```html run height=100
 <p>...content before scripts...</p>
 
 <script>
-  document.addEventListener('DOMContentLoaded', () => alert("DOM ready after defer!")); // (2)
+  document.addEventListener('DOMContentLoaded', () => alert("DOM ready after defer!"));
 </script>
 
 <script defer src="https://javascript.info/article/script-async-defer/long.js?speed=1"></script>
@@ -68,40 +70,44 @@ The following example demonstrates that:
 ```
 
 1. The page content shows up immediately.
-2. `DOMContentLoaded` waits for the deferred script. It only triggers when the script `(2)` is downloaded and executed.
+2. `DOMContentLoaded` event handler waits for the deferred script. It only triggers when the script is downloaded and executed.
 
-Deferred scripts keep their relative order, just like regular scripts.
+**Deferred scripts keep their relative order, just like regular scripts.**
 
-So, if we have a long script first, and then a smaller one, then the latter one waits.
+Let's say, we have two deferred scripts: the `long.js` and then `small.js`:
 
 ```html
 <script defer src="https://javascript.info/article/script-async-defer/long.js"></script>
 <script defer src="https://javascript.info/article/script-async-defer/small.js"></script>
 ```
 
-```smart header="The small script downloads first, runs second"
-Browsers scan the page for scripts and download them in parallel, to improve performance. So in the example above both scripts download in parallel. The `small.js` probably makes it first.
+Browsers scan the page for scripts and download them in parallel, to improve performance. So in the example above both scripts download in parallel. The `small.js` probably finishes first.
 
-But the specification requires scripts to execute in the document order, so it waits for `long.js` to execute.
-```
+...But the `defer` attribute, besides telling the browser "not to block", ensures that the relative order is kept. So even though `small.js` loads first, it still waits and runs after `long.js` executes.
+
+That may be important for cases when we need to load a JavaScript library and then a script that depends on it.
 
 ```smart header="The `defer` attribute is only for external scripts"
 The `defer` attribute is ignored if the `<script>` tag has no `src`.
 ```
 
-
 ## async
 
+The `async` attribute is somewhat like `defer`. It also makes the script non-blocking. But it has important differences in the behavior.
+
 The `async` attribute means that a script is completely independent:
 
-- The page doesn't wait for async scripts, the contents are processed and displayed.
+- The browser doesn't block on `async` scripts (like `defer`).
+- Other scripts don't wait for `async` scripts, and `async` scripts don't wait for them.
 - `DOMContentLoaded` and async scripts don't wait for each other:
     - `DOMContentLoaded` may happen both before an async script (if an async script finishes loading after the page is complete)
     - ...or after an async script (if an async script is short or was in HTTP-cache)
-- Other scripts don't wait for `async` scripts, and `async` scripts don't wait for them.
 
+In other words, `async` scripts load in the background and run when ready. The DOM and other scripts don't wait for them, and they don't wait for anything. A fully independent script that runs when loaded. As simple, at it can get, right?
+
+Here's an example similar to what we've seen with `defer`: two scripts `long.js` and `small.js`, but now with `async` instead of `defer`.
 
-So, if we have several `async` scripts, they may execute in any order. Whatever loads first -- runs first:
+They don't wait for each other. Whatever loads first (probably `small.js`) -- runs first:
 
 ```html run height=100
 <p>...content before scripts...</p>
@@ -116,9 +122,9 @@ So, if we have several `async` scripts, they may execute in any order. Whatever
 <p>...content after scripts...</p>
 ```
 
-1. The page content shows up immediately: `async` doesn't block it.
-2. `DOMContentLoaded` may happen both before and after `async`, no guarantees here.
-3. Async scripts don't wait for each other. A smaller script `small.js` goes second, but probably loads before `long.js`, so runs first. That's called a "load-first" order.
+- The page content shows up immediately: `async` doesn't block it.
+- `DOMContentLoaded` may happen both before and after `async`, no guarantees here.
+- A smaller script `small.js` goes second, but probably loads before `long.js`, so `small.js` runs first. Although, it might be that `long.js` loads first, if cached, then it runs first. In other words, async scripts run in the "load-first" order.
 
 Async scripts are great when we integrate an independent third-party script into the page: counters, ads and so on, as they don't depend on our scripts, and our scripts shouldn't wait for them:
 
@@ -127,10 +133,11 @@ Async scripts are great when we integrate an independent third-party script into
 <script async src="https://google-analytics.com/analytics.js"></script>
 ```
 
-
 ## Dynamic scripts
+ 
+There's one more important way of adding a script to the page.
 
-We can also add a script dynamically using JavaScript:
+We can create a script and append it to the document dynamically using JavaScript:
 
 ```js run
 let script = document.createElement('script');
@@ -146,20 +153,11 @@ That is:
 - They don't wait for anything, nothing waits for them.
 - The script that loads first -- runs first ("load-first" order).
 
+This can be changed if we explicitly set `script.async=false`. Then scripts will be executed in the document order, just like `defer`.
 
-```js run
-let script = document.createElement('script');
-script.src = "/article/script-async-defer/long.js";
-
-*!*
-script.async = false;
-*/!*
-
-document.body.append(script);
-```
-
-For example, here we add two scripts. Without `script.async=false` they would execute in load-first order (the `small.js` probably first). But with that flag the order is "as in the document":
+In this example, `loadScript(src)` function adds a script and also sets `async` to `false`.
 
+So `long.js` always runs first (as it's added first):
 
 ```js run
 function loadScript(src) {
@@ -174,6 +172,10 @@ loadScript("/article/script-async-defer/long.js");
 loadScript("/article/script-async-defer/small.js");
 ```
 
+Without `script.async=false`, scripts would execute in default, load-first order (the `small.js` probably first).
+
+Again, as with the `defer`, the order matters if we'd like to load a library and then another script that depends on it.
+
 
 ## Summary
 
@@ -183,15 +185,17 @@ But there are also essential differences between them:
 
 |         | Order | `DOMContentLoaded` |
 |---------|---------|---------|
-| `async` | *Load-first order*. Their document order doesn't matter -- which loads first |  Irrelevant. May load and execute while the document has not yet been fully downloaded. That happens if scripts are small or cached, and the document is long enough. |
+| `async` | *Load-first order*. Their document order doesn't matter -- which loads first runs first |  Irrelevant. May load and execute while the document has not yet been fully downloaded. That happens if scripts are small or cached, and the document is long enough. |
 | `defer` | *Document order* (as they go in the document). |  Execute after the document is loaded and parsed (they wait if needed), right before `DOMContentLoaded`. |
 
+In practice, `defer` is used for scripts that need the whole DOM and/or their relative execution order is important. 
+
+And  `async` is used for independent scripts, like counters or ads. And their relative execution order does not matter.
+
 ```warn header="Page without scripts should be usable"
-Please note that if you're using `defer`, then the page is visible *before* the script loads.
+Please note: if you're using `defer` or `async`, then user will see the the page *before* the script loads.
 
-So the user may read the page, but some graphical components are probably not ready yet.
+In such case, some graphical components are probably not initialized yet.
 
-There should be "loading" indications in the proper places, and disabled buttons should show as such, so the user can clearly see what's ready and what's not.
+Don't forget to put "loading" indication and disable buttons that aren't functional yet. Let the user clearly see what he can do on the page, and what's still getting ready.
 ```
-
-In practice, `defer` is used for scripts that need the whole DOM and/or their relative execution order is important. And  `async` is used for independent scripts, like counters or ads. And their relative execution order does not matter.
diff --git a/2-ui/5-loading/03-onload-onerror/article.md b/2-ui/5-loading/03-onload-onerror/article.md
index 162c9060e..590e54ab4 100644
--- a/2-ui/5-loading/03-onload-onerror/article.md
+++ b/2-ui/5-loading/03-onload-onerror/article.md
@@ -41,8 +41,8 @@ document.head.append(script);
 
 *!*
 script.onload = function() {
-  // the script creates a helper function "_"
-  alert(_); // the function is available
+  // the script creates a variable "_"
+  alert( _.VERSION ); // shows library version
 };
 */!*
 ```
diff --git a/2-ui/99-ui-misc/01-mutation-observer/article.md b/2-ui/99-ui-misc/01-mutation-observer/article.md
index 6a458fa02..3cf6f5397 100644
--- a/2-ui/99-ui-misc/01-mutation-observer/article.md
+++ b/2-ui/99-ui-misc/01-mutation-observer/article.md
@@ -1,7 +1,7 @@
 
 # Mutation observer
 
-`MutationObserver` is a built-in object that observes a DOM element and fires a callback in case of changes.
+`MutationObserver` is a built-in object that observes a DOM element and fires a callback when it detects a change.
 
 We'll first take a look at the syntax, and then explore a real-world use case, to see where such thing may be useful.
 
@@ -128,16 +128,16 @@ Such snippet in an HTML markup looks like this:
 ...
 ```
 
-Also we'll use a JavaScript highlighting library on our site, e.g. [Prism.js](https://prismjs.com/). A call to `Prism.highlightElem(pre)` examines the contents of such `pre` elements and adds into them special tags and styles for colored syntax highlighting, similar to what you see in examples here, at this page.
+For better readability and at the same time, to beautify it, we'll be using a JavaScript syntax highlighting library on our site, like [Prism.js](https://prismjs.com/). To get syntax highlighting for above snippet in Prism, `Prism.highlightElem(pre)` is called, which examines the contents of such `pre` elements and adds special tags and styles for colored syntax highlighting into those elements, similar to what you see in examples here, on this page.
 
-When exactly to run that highlighting method? We can do it on `DOMContentLoaded` event, or at the bottom of the page. At that moment we have our DOM ready, can search for elements `pre[class*="language"]` and call `Prism.highlightElem` on them:
+When exactly should we run that highlighting method? Well, we can do it on `DOMContentLoaded` event, or put the script at the bottom of the page. The moment our DOM is ready, we can search for elements `pre[class*="language"]` and call `Prism.highlightElem` on them:
 
 ```js
 // highlight all code snippets on the page
 document.querySelectorAll('pre[class*="language"]').forEach(Prism.highlightElem);
 ```
 
-Everything's simple so far, right? There are `<pre>` code snippets in HTML, we highlight them.
+Everything's simple so far, right? We find code snippets in HTML and highlight them.
 
 Now let's go on. Let's say we're going to dynamically fetch materials from a server. We'll study methods for that [later in the tutorial](info:fetch). For now it only matters that we fetch an HTML article from a webserver and display it on demand:
 
@@ -162,13 +162,13 @@ snippets.forEach(Prism.highlightElem);
 */!*
 ```
 
-...But imagine, we have many places in the code where we load contents: articles, quizzes, forum posts. Do we need to put the highlighting call everywhere? That's not very convenient, and also easy to forget.
+...But, imagine if we have many places in the code where we load our content - articles, quizzes, forum posts, etc. Do we need to put the highlighting call everywhere, to highlight the code in content after loading? That's not very convenient.
 
-And what if the content is loaded by a third-party module? E.g. we have a forum written by someone else, that loads contents dynamically, and we'd like to add syntax highlighting to it. No one likes to patch third-party scripts.
+And what if the content is loaded by a third-party module? For example, we have a forum written by someone else, that loads content dynamically, and we'd like to add syntax highlighting to it. No one likes patching third-party scripts.
 
 Luckily, there's another option.
 
-We can use `MutationObserver` to automatically detect when code snippets are inserted in the page and highlight them.
+We can use `MutationObserver` to automatically detect when code snippets are inserted into the page and highlight them.
 
 So we'll handle the highlighting functionality in one place, relieving us from the need to integrate it.
 
@@ -236,30 +236,37 @@ There's a method to stop observing the node:
 
 - `observer.disconnect()` -- stops the observation.
 
-When we stop the observing, it might be possible that some changes were not processed by the observer yet.
+When we stop the observing, it might be possible that some changes were not yet processed by the observer. In such cases, we use
 
-- `observer.takeRecords()` -- gets a list of unprocessed mutation records, those that happened, but the callback did not handle them.
+- `observer.takeRecords()` -- gets a list of unprocessed mutation records - those that happened, but the callback has not handled them.
 
 These methods can be used together, like this:
 
 ```js
-// we'd like to stop tracking changes
-observer.disconnect();
-
-// handle unprocessed some mutations
+// get a list of unprocessed mutations
+// should be called before disconnecting,
+// if you care about possibly unhandled recent mutations
 let mutationRecords = observer.takeRecords();
+
+// stop tracking changes
+observer.disconnect();
 ...
 ```
 
+
+```smart header="Records returned by `observer.takeRecords()` are removed from the processing queue"
+The callback won't be called for records, returned by `observer.takeRecords()`.
+```
+
 ```smart header="Garbage collection interaction"
-Observers use weak references to nodes internally. That is: if a node is removed from DOM, and becomes unreachable, then it becomes garbage collected.
+Observers use weak references to nodes internally. That is, if a node is removed from the DOM, and becomes unreachable, then it can be garbage collected.
 
 The mere fact that a DOM node is observed doesn't prevent the garbage collection.
 ```
 
 ## Summary  
 
-`MutationObserver` can react on changes in DOM: attributes, added/removed elements, text content.
+`MutationObserver` can react to changes in DOM - attributes, text content and adding/removing elements.
 
 We can use it to track changes introduced by other parts of our code, as well as to integrate with third-party scripts.
 
diff --git a/2-ui/99-ui-misc/02-selection-range/article.md b/2-ui/99-ui-misc/02-selection-range/article.md
index 6f4d6814b..9b6deb0d3 100644
--- a/2-ui/99-ui-misc/02-selection-range/article.md
+++ b/2-ui/99-ui-misc/02-selection-range/article.md
@@ -259,7 +259,7 @@ Click buttons to run methods on the selection, "resetExample" to reset it.
 </script>
 ```
 
-There also exist methods to compare ranges, but these are rarely used. When you need them, please refer to the [spec](https://dom.spec.whatwg.org/#interface-range) or [MDN manual](https://developer.mozilla.org/en-US/docs/Web/API/Range).
+There also exist methods to compare ranges, but these are rarely used. When you need them, please refer to the [spec](https://dom.spec.whatwg.org/#interface-range) or [MDN manual](mdn:/api/Range).
 
 
 ## Selection
@@ -620,7 +620,7 @@ The second API is very simple, as it works with text.
 The most used recipes are probably:
 
 1. Getting the selection:
-    ```js run
+    ```js
     let selection = document.getSelection();
 
     let cloned = /* element to clone the selected nodes to */;
@@ -632,7 +632,7 @@ The most used recipes are probably:
     }
     ```
 2. Setting the selection:
-    ```js run
+    ```js
     let selection = document.getSelection();
 
     // directly:
diff --git a/2-ui/99-ui-misc/03-event-loop/article.md b/2-ui/99-ui-misc/03-event-loop/article.md
index 4a1625288..3ea0c2c57 100644
--- a/2-ui/99-ui-misc/03-event-loop/article.md
+++ b/2-ui/99-ui-misc/03-event-loop/article.md
@@ -9,7 +9,7 @@ In this chapter we first cover theoretical details about how things work, and th
 
 ## Event Loop
 
-The concept of *event loop* is very simple. There's an endless loop, when JavaScript engine waits for tasks, executes them and then sleeps waiting for more tasks.
+The *event loop* concept is very simple. There's an endless loop, where the JavaScript engine waits for tasks, executes them and then sleeps, waiting for more tasks.
 
 The general algorithm of the engine:
 
@@ -17,7 +17,7 @@ The general algorithm of the engine:
     - execute them, starting with the oldest task.
 2. Sleep until a task appears, then go to 1.
 
-That's a formalization for what we see when browsing a page. JavaScript engine does nothing most of the time, only runs if a script/handler/event activates.
+That's a formalization for what we see when browsing a page. The JavaScript engine does nothing most of the time, it only runs if a script/handler/event activates.
 
 Examples of tasks:
 
@@ -41,10 +41,10 @@ Tasks from the queue are processed on "first come – first served" basis. When
 So far, quite simple, right?
 
 Two more details:
-1. Rendering never happens while the engine executes a task. Doesn't matter if the task takes a long time. Changes to DOM are painted only after the task is complete.
-2. If a task takes too long, the browser can't do other tasks, process user events, so after a time it raises an alert like "Page Unresponsive" suggesting to kill the task with the whole page. That happens when there are a lot of complex calculations or a programming error leading to infinite loop.
+1. Rendering never happens while the engine executes a task. It doesn't matter if the task takes a long time. Changes to the DOM are painted only after the task is complete.
+2. If a task takes too long, the browser can't do other tasks, such as processing user events. So after a time, it raises an alert like "Page Unresponsive", suggesting killing the task with the whole page. That happens when there are a lot of complex calculations or a programming error leading to an infinite loop.
 
-That was a theory. Now let's see how we can apply that knowledge.
+That was the theory. Now let's see how we can apply that knowledge.
 
 ## Use-case 1: splitting CPU-hungry tasks
 
@@ -160,7 +160,7 @@ Finally, we've split a CPU-hungry task into parts - now it doesn't block the use
 
 Another benefit of splitting heavy tasks for browser scripts is that we can show progress indication.
 
-Usually the browser renders after the currently running code is complete. Doesn't matter if the task takes a long time. Changes to DOM are painted only after the task is finished.
+As mentioned earlier, changes to DOM are painted only after the currently running task is completed, irrespective of how long it takes.
 
 On one hand, that's great, because our function may create many elements, add them one-by-one to the document and change their styles -- the visitor won't see any "intermediate", unfinished state. An important thing, right?
 
@@ -238,7 +238,7 @@ menu.onclick = function() {
 
 ## Macrotasks and Microtasks
 
-Along with *macrotasks*, described in this chapter, there exist *microtasks*, mentioned in the chapter <info:microtask-queue>.
+Along with *macrotasks*, described in this chapter, there are *microtasks*, mentioned in the chapter <info:microtask-queue>.
 
 Microtasks come solely from our code. They are usually created by promises: an execution of `.then/catch/finally` handler becomes a microtask. Microtasks are used "under the cover" of `await` as well, as it's another form of promise handling.
 
@@ -303,7 +303,7 @@ Here's an example with "counting progress bar", similar to the one shown previou
 
 ## Summary
 
-The more detailed algorithm of the event loop (though still simplified compare to the [specification](https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-processing-model)):
+A more detailed event loop algorithm (though still simplified compared to the [specification](https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-processing-model)):
 
 1. Dequeue and run the oldest task from the *macrotask* queue (e.g. "script").
 2. Execute all *microtasks*:
@@ -316,7 +316,7 @@ The more detailed algorithm of the event loop (though still simplified compare t
 To schedule a new *macrotask*:
 - Use zero delayed `setTimeout(f)`.
 
-That may be used to split a big calculation-heavy task into pieces, for the browser to be able to react on user events and show progress between them.
+That may be used to split a big calculation-heavy task into pieces, for the browser to be able to react to user events and show progress between them.
 
 Also, used in event handlers to schedule an action after the event is fully handled (bubbling done).
 
diff --git a/3-frames-and-windows/01-popup-windows/article.md b/3-frames-and-windows/01-popup-windows/article.md
index 1ce04b7c4..7540b0304 100644
--- a/3-frames-and-windows/01-popup-windows/article.md
+++ b/3-frames-and-windows/01-popup-windows/article.md
@@ -7,7 +7,7 @@ Basically, you just run:
 window.open('https://javascript.info/')
 ```
 
-...And it will open a new window with given URL. Most modern browsers are configured to open new tabs instead of separate windows.
+...And it will open a new window with given URL. Most modern browsers are configured to open url in new tabs instead of separate windows.
 
 Popups exist from really ancient times. The initial idea was to show another content without closing the main window. As of now, there are other ways to do that: we can load content dynamically with [fetch](info:fetch) and show it in a dynamically generated `<div>`. So, popups is not something we use everyday.
 
@@ -15,7 +15,7 @@ Also, popups are tricky on mobile devices, that don't show multiple windows simu
 
 Still, there are tasks where popups are still used, e.g. for OAuth authorization (login with Google/Facebook/...), because:
 
-1. A popup is a separate window with its own independent JavaScript environment. So opening a popup with a third-party non-trusted site is safe.
+1. A popup is a separate window which has its own independent JavaScript environment. So opening a popup from a third-party, non-trusted site is safe.
 2. It's very easy to open a popup.
 3. A popup can navigate (change URL) and send messages to the opener window.
 
@@ -69,7 +69,7 @@ name
 : A name of the new window. Each window has a `window.name`, and here we can specify which window to use for the popup. If there's already a window with such name -- the given URL opens in it, otherwise a new window is opened.
 
 params
-: The configuration string for the new window. It contains settings, delimited by a comma. There must be no spaces in params, for instance: `width:200,height=100`.
+: The configuration string for the new window. It contains settings, delimited by a comma. There must be no spaces in params, for instance: `width=200,height=100`.
 
 Settings for `params`:
 
@@ -89,7 +89,7 @@ There is also a number of less supported browser-specific features, which are us
 
 ## Example: a minimalistic window   
 
-Let's open a window with minimal set of features just to see which of them browser allows to disable:
+Let's open a window with minimal set of features, just to see which of them browser allows to disable:
 
 ```js run
 let params = `scrollbars=no,resizable=no,status=no,location=no,toolbar=no,menubar=no,
@@ -237,21 +237,23 @@ There's also `window.onscroll` event.
 
 ## Focus/blur on a window
 
-Theoretically, there are `window.focus()` and `window.blur()` methods to focus/unfocus on a window.  Also there are `focus/blur` events that allow to focus a window and catch the moment when the visitor switches elsewhere.
+Theoretically, there are `window.focus()` and `window.blur()` methods to focus/unfocus on a window. And there are also `focus/blur` events that allow to catch the moment when the visitor focuses on a window and switches elsewhere.
 
-In the past evil pages abused those. For instance, look at this code:
+Although, in practice they are severely limited, because in the past evil pages abused them. 
+
+For instance, look at this code:
 
 ```js run
 window.onblur = () => window.focus();
 ```
 
-When a user attempts to switch out of the window (`blur`), it brings it back to focus. The intention is to "lock" the user within the `window`.
+When a user attempts to switch out of the window (`window.onblur`), it brings the window back into focus. The intention is to "lock" the user within the `window`.
 
-So, there are limitations that forbid the code like that. There are many limitations to protect the user from ads and evils pages. They depend on the browser.
+So browsers had to introduce many limitations to forbid the code like that and protect the user from ads and evils pages. They depend on the browser.
 
-For instance, a mobile browser usually ignores that call completely. Also focusing doesn't work when a popup opens in a separate tab rather than a new window.
+For instance, a mobile browser usually ignores `window.focus()` completely. Also focusing doesn't work when a popup opens in a separate tab rather than a new window.
 
-Still, there are some things that can be done.
+Still, there are some use cases when such calls do work and can be useful.
 
 For instance:
 
diff --git a/3-frames-and-windows/03-cross-window-communication/article.md b/3-frames-and-windows/03-cross-window-communication/article.md
index 53f5f55fc..091a0cecb 100644
--- a/3-frames-and-windows/03-cross-window-communication/article.md
+++ b/3-frames-and-windows/03-cross-window-communication/article.md
@@ -263,7 +263,7 @@ The window that wants to send a message calls [postMessage](mdn:api/Window.postM
 Arguments:
 
 `data`
-: The data to send. Can be any object, the data is cloned using the "structured cloning algorithm". IE supports only strings, so we should `JSON.stringify` complex objects to support that browser.
+: The data to send. Can be any object, the data is cloned using the "structured serialization algorithm". IE supports only strings, so we should `JSON.stringify` complex objects to support that browser.
 
 `targetOrigin`
 : Specifies the origin for the target window, so that only a window from the given origin will get the message.
diff --git a/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html b/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
index 478830610..46dd7b5cc 100644
--- a/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
+++ b/3-frames-and-windows/03-cross-window-communication/sandbox.view/index.html
@@ -7,7 +7,7 @@
 
 <body>
 
-  <div>The iframe below is has <code>sandbox</code> attribute.</div>
+  <div>The iframe below has the <code>sandbox</code> attribute.</div>
 
   <iframe sandbox src="sandboxed.html" style="height:60px;width:90%"></iframe>
 
diff --git a/4-binary/01-arraybuffer-binary-arrays/article.md b/4-binary/01-arraybuffer-binary-arrays/article.md
index 278f41f73..4beb6f5cd 100644
--- a/4-binary/01-arraybuffer-binary-arrays/article.md
+++ b/4-binary/01-arraybuffer-binary-arrays/article.md
@@ -209,7 +209,7 @@ These methods allow us to copy typed arrays, mix them, create new arrays from ex
 
 ## DataView
 
-[DataView](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView) is a special super-flexible "untyped" view over `ArrayBuffer`. It allows to access the data on any offset in any format.
+[DataView](mdn:/JavaScript/Reference/Global_Objects/DataView) is a special super-flexible "untyped" view over `ArrayBuffer`. It allows to access the data on any offset in any format.
 
 - For typed arrays, the constructor dictates what the format is. The whole array is supposed to be uniform. The i-th number is `arr[i]`.
 - With `DataView` we access the data with methods like `.getUint8(i)` or `.getUint16(i)`. We choose the format at method call time instead of the construction time.
@@ -235,7 +235,7 @@ let dataView = new DataView(buffer);
 // get 8-bit number at offset 0
 alert( dataView.getUint8(0) ); // 255
 
-// now get 16-bit number at offset 0, it consists of 2 bytes, together iterpreted as 65535
+// now get 16-bit number at offset 0, it consists of 2 bytes, together interpreted as 65535
 alert( dataView.getUint16(0) ); // 65535 (biggest 16-bit unsigned int)
 
 // get 32-bit number at offset 0
@@ -244,7 +244,7 @@ alert( dataView.getUint32(0) ); // 4294967295 (biggest 32-bit unsigned int)
 dataView.setUint32(0, 0); // set 4-byte number to zero, thus setting all bytes to 0
 ```
 
-`DataView` is great when we store mixed-format data in the same buffer. E.g we store a sequence of pairs (16-bit integer, 32-bit float). Then `DataView` allows to access them easily.
+`DataView` is great when we store mixed-format data in the same buffer. For example, when we store a sequence of pairs (16-bit integer, 32-bit float), `DataView` allows to access them easily.
 
 ## Summary
 
diff --git a/4-binary/03-blob/article.md b/4-binary/03-blob/article.md
index 062e1834b..bb475bc7f 100644
--- a/4-binary/03-blob/article.md
+++ b/4-binary/03-blob/article.md
@@ -97,7 +97,7 @@ That's what the value of `link.href` looks like:
 blob:https://javascript.info/1e67e00e-860d-40a5-89ae-6ab0cbee6273
 ```
 
-The browser for each URL generated by `URL.createObjectURL` stores an the URL -> `Blob` mapping internally. So such URLs are short, but allow to access the `Blob`.
+For each URL generated by `URL.createObjectURL` the browser stores a URL -> `Blob` mapping internally. So such URLs are short, but allow to access the `Blob`.
 
 A generated URL (and hence the link with it) is only valid within the current document, while it's open. And it allows to reference the `Blob` in `<img>`, `<a>`, basically any other object that expects an url.
 
@@ -119,7 +119,7 @@ An alternative to `URL.createObjectURL` is to convert a `Blob` into a base64-enc
 
 That encoding represents binary data as a string of ultra-safe "readable" characters with ASCII-codes from 0 to 64. And what's more important -- we can use this encoding in "data-urls".
 
-A [data url](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) has the form `data:[<mediatype>][;base64],<data>`. We can use such urls everywhere, on par with "regular" urls.
+A [data url](mdn:/http/Data_URIs) has the form `data:[<mediatype>][;base64],<data>`. We can use such urls everywhere, on par with "regular" urls.
 
 For instance, here's a smiley:
 
@@ -166,8 +166,8 @@ We can create a `Blob` of an image, an image part, or even make a page screensho
 
 Image operations are done via `<canvas>` element:
 
-1. Draw an image (or its part) on canvas using [canvas.drawImage](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawImage).
-2. Call canvas method [.toBlob(callback, format, quality)](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob) that creates a `Blob` and runs `callback` with it when done.
+1. Draw an image (or its part) on canvas using [canvas.drawImage](mdn:/api/CanvasRenderingContext2D/drawImage).
+2. Call canvas method [.toBlob(callback, format, quality)](mdn:/api/HTMLCanvasElement/toBlob) that creates a `Blob` and runs `callback` with it when done.
 
 In the example below, an image is just copied, but we could cut from it, or transform it on canvas prior to making a blob:
 
diff --git a/5-network/01-fetch/01-fetch-users/solution.md b/5-network/01-fetch/01-fetch-users/solution.md
index b8dfb62a2..3cb88e4ea 100644
--- a/5-network/01-fetch/01-fetch-users/solution.md
+++ b/5-network/01-fetch/01-fetch-users/solution.md
@@ -3,7 +3,7 @@ To fetch a user we need: `fetch('https://api.github.com/users/USERNAME')`.
 
 If the response has status `200`, call `.json()` to read the JS object.
 
-Otherwise, if a `fetch` fails, or the response has non-200 status, we just return `null` in the resulting arrray.
+Otherwise, if a `fetch` fails, or the response has non-200 status, we just return `null` in the resulting array.
 
 So here's the code:
 
diff --git a/5-network/01-fetch/article.md b/5-network/01-fetch/article.md
index 6acd8cb59..8db2243b3 100644
--- a/5-network/01-fetch/article.md
+++ b/5-network/01-fetch/article.md
@@ -65,7 +65,7 @@ if (response.ok) { // if HTTP-status is 200-299
 - **`response.json()`** -- parse the response as JSON,
 - **`response.formData()`** -- return the response as `FormData` object (explained in the [next chapter](info:formdata)),
 - **`response.blob()`** -- return the response as [Blob](info:blob) (binary data with type),
-- **`response.arrayBuffer()`** -- return the response as [ArrayBuffer](info:arraybuffer-binary-arrays) (low-level representaion of binary data),
+- **`response.arrayBuffer()`** -- return the response as [ArrayBuffer](info:arraybuffer-binary-arrays) (low-level representation of binary data),
 - additionally, `response.body` is a [ReadableStream](https://streams.spec.whatwg.org/#rs-class) object, it allows you to read the body chunk-by-chunk, we'll see an example later.
 
 For instance, let's get a JSON-object with latest commits from GitHub:
diff --git a/5-network/04-fetch-abort/article.md b/5-network/04-fetch-abort/article.md
index 757846287..9efadd0ee 100644
--- a/5-network/04-fetch-abort/article.md
+++ b/5-network/04-fetch-abort/article.md
@@ -1,61 +1,81 @@
 
 # Fetch: Abort
 
-As we know, `fetch` returns a promise. And JavaScript generally has no concept of "aborting" a promise. So how can we abort a `fetch`?
+As we know, `fetch` returns a promise. And JavaScript generally has no concept of "aborting" a promise. So how can we cancel an ongoing `fetch`? E.g. if the user actions on our site indicate that the `fetch` isn't needed any more.
 
-There's a special built-in object for such purposes: `AbortController`, that can be used to abort not only `fetch`, but other asynchronous tasks as well.
+There's a special built-in object for such purposes: `AbortController`. It can be used to abort not only `fetch`, but other asynchronous tasks as well.
 
-The usage is pretty simple:
+The usage is very straightforward:
 
-- Step 1: create a controller:
+## The AbortController object
 
-    ```js
-    let controller = new AbortController();
-    ```
+Create a controller:
 
-    A controller is an extremely simple object.
+```js
+let controller = new AbortController();
+```
 
-    - It has a single method `abort()`, and a single property `signal`.
-    - When `abort()` is called:
-        - `abort` event triggers on `controller.signal`
-        - `controller.signal.aborted` property becomes `true`.
+A controller is an extremely simple object.
 
-    All parties interested to learn about `abort()` call set listeners on `controller.signal` to track it.
+- It has a single method `abort()`,
+- And a single property `signal` that allows to set event liseners on it.
 
-    Like this (without `fetch` yet):
+When `abort()` is called:
+- `controller.signal` emits the `"abort"` event.
+- `controller.signal.aborted` property becomes `true`.
 
-    ```js run
-    let controller = new AbortController();
-    let signal = controller.signal;
+Generally, we have two parties in the process: 
+1. The one that performs an cancelable operation, it sets a listener on `controller.signal`.
+2. The one one that cancels: it calls `controller.abort()` when needed.
 
-    // triggers when controller.abort() is called
-    signal.addEventListener('abort', () => alert("abort!"));
+Here's the full example (without `fetch` yet):
 
-    controller.abort(); // abort!
+```js run
+let controller = new AbortController();
+let signal = controller.signal;
+
+// The party that performs a cancelable operation 
+// gets "signal" object
+// and sets the listener to trigger when controller.abort() is called
+signal.addEventListener('abort', () => alert("abort!"));
 
-    alert(signal.aborted); // true
-    ```
+// The other party, that cancels (at any point later):
+controller.abort(); // abort!
 
-- Step 2: pass the `signal` property to `fetch` option:
+// The event triggers and signal.aborted becomes true
+alert(signal.aborted); // true
+```
 
-    ```js
-    let controller = new AbortController();
-    fetch(url, {
-      signal: controller.signal
-    });
-    ```
+As we can see, `AbortController` is just a means to pass `abort` events when `abort()` is called on it.
 
-    The `fetch` method knows how to work with `AbortController`, it listens to `abort` on `signal`.
+We could implement same kind of event listening in our code on our own, without `AbortController` object at all.
 
-- Step 3: to abort, call `controller.abort()`:
+But what's valuable is that `fetch` knows how to work with `AbortController` object, it's integrated with it. 
 
-    ```js
-    controller.abort();
-    ```
+## Using with fetch
 
-    We're done: `fetch` gets the event from `signal` and aborts the request.
+To become able to cancel `fetch`, pass the `signal` property of an `AbortController` as a `fetch` option:
 
-When a fetch is aborted, its promise rejects with an error `AbortError`, so we should handle it, e.g. in `try..catch`:
+```js
+let controller = new AbortController();
+fetch(url, {
+  signal: controller.signal
+});
+```
+
+The `fetch` method knows how to work with `AbortController`. It will listen to `abort` events on `signal`.
+
+Now, to abort, call `controller.abort()`:
+
+```js
+controller.abort();
+```
+
+We're done: `fetch` gets the event from `signal` and aborts the request.
+
+When a fetch is aborted, its promise rejects with an error `AbortError`, so we should handle it, e.g. in `try..catch`.
+
+Here's the full example with `fetch` aborted after 1 second:
 
 ```js run async
 // abort in 1 second
@@ -75,15 +95,18 @@ try {
 }
 ```
 
-**`AbortController` is scalable, it allows to cancel multiple fetches at once.**
+## AbortController is scalable
 
-For instance, here we fetch many `urls` in parallel, and the controller aborts them all:
+`AbortController` is scalable, it allows to cancel multiple fetches at once.
+
+Here's a sketch of code that fetches many `urls` in parallel, and uses a single controller to abort them all:
 
 ```js
 let urls = [...]; // a list of urls to fetch in parallel
 
 let controller = new AbortController();
 
+// an array of fetch promises
 let fetchJobs = urls.map(url => fetch(url, {
   signal: controller.signal
 }));
@@ -94,9 +117,9 @@ let results = await Promise.all(fetchJobs);
 // it aborts all fetches
 ```
 
-If we have our own asynchronous jobs, different from `fetch`, we can use a single `AbortController` to stop those, together with fetches.
+If we have our own asynchronous tasks, different from `fetch`, we can use a single `AbortController` to stop those, together with fetches.
 
-We just need to listen to its `abort` event:
+We just need to listen to its `abort` event in our tasks:
 
 ```js
 let urls = [...];
@@ -118,4 +141,8 @@ let results = await Promise.all([...fetchJobs, ourJob]);
 // it aborts all fetches and ourJob
 ```
 
-So `AbortController` is not only for `fetch`, it's a universal object to abort asynchronous tasks, and `fetch` has built-in integration with it.
+## Summary
+
+- `AbortController` is a simple object that generates `abort` event on it's `signal` property when `abort()` method is called (and also sets `signal.aborted` to `true`).
+- `fetch` integrates with it: we pass `signal` property as the option, and then `fetch` listens to it, so it becomes possible to abort the `fetch`.
+- We can use `AbortController` in our code. The "call `abort()`" -> "listen to `abort` event" interaction is simple and universal. We can use it even without `fetch`.
diff --git a/5-network/05-fetch-crossorigin/article.md b/5-network/05-fetch-crossorigin/article.md
index 36c57aed4..0c1429697 100644
--- a/5-network/05-fetch-crossorigin/article.md
+++ b/5-network/05-fetch-crossorigin/article.md
@@ -214,6 +214,7 @@ A preflight request uses method `OPTIONS`, no body and two headers:
 
 If the server agrees to serve the requests, then it should respond with empty body, status 200 and headers:
 
+- `Access-Control-Allow-Origin` must be either `*` or the requesting origin, such as `https://javascript.info`, to allow it.
 - `Access-Control-Allow-Methods` must have the allowed method.
 - `Access-Control-Allow-Headers` must have a list of allowed headers.
 - Additionally, the header `Access-Control-Max-Age` may specify a number of seconds to cache the permissions. So the browser won't have to send a preflight for subsequent requests that satisfy given permissions.
@@ -259,15 +260,19 @@ Access-Control-Request-Headers: Content-Type,API-Key
 ### Step 2 (preflight response)
 
 The server should respond with status 200 and headers:
+- `Access-Control-Allow-Origin: https://javascript.info`
 - `Access-Control-Allow-Methods: PATCH`
 - `Access-Control-Allow-Headers: Content-Type,API-Key`.
 
 That allows future communication, otherwise an error is triggered.
 
-If the server expects other methods and headers in the future, it makes sense to allow them in advance by adding to the list:
+If the server expects other methods and headers in the future, it makes sense to allow them in advance by adding to the list.
+
+For example, this response also allows `PUT`, `DELETE` and additional headers:
 
 ```http
 200 OK
+Access-Control-Allow-Origin: https://javascript.info
 Access-Control-Allow-Methods: PUT,PATCH,DELETE
 Access-Control-Allow-Headers: API-Key,Content-Type,If-Modified-Since,Cache-Control
 Access-Control-Max-Age: 86400
@@ -275,7 +280,7 @@ Access-Control-Max-Age: 86400
 
 Now the browser can see that `PATCH` is in `Access-Control-Allow-Methods` and `Content-Type,API-Key` are in the list `Access-Control-Allow-Headers`, so it sends out the main request.
 
-Besides, the preflight response is cached for time, specified by `Access-Control-Max-Age` header (86400 seconds, one day), so subsequent requests will not cause a preflight. Assuming that they fit the cached allowances, they will be sent directly.
+If there's header `Access-Control-Max-Age` with a number of seconds, then the preflight permissions are cached for the given time. The response above will be cached for 86400 seconds (one day). Within this timeframe, subsequent requests will not cause a preflight. Assuming that they fit the cached allowances, they will be sent directly.
 
 ### Step 3 (actual request)
 
@@ -329,7 +334,7 @@ fetch('http://another.com', {
 });
 ```
 
-Now `fetch` sends cookies originating from `another.com` without request to that site.
+Now `fetch` sends cookies originating from `another.com` with request to that site.
 
 If the server agrees to accept the request *with credentials*, it should add a header `Access-Control-Allow-Credentials: true` to the response, in addition to `Access-Control-Allow-Origin`.
 
diff --git a/5-network/05-fetch-crossorigin/xhr-another-domain.svg b/5-network/05-fetch-crossorigin/xhr-another-domain.svg
index 735ab6c7b..2c1b1a9ad 100644
--- a/5-network/05-fetch-crossorigin/xhr-another-domain.svg
+++ b/5-network/05-fetch-crossorigin/xhr-another-domain.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="633" height="411" viewBox="0 0 633 411"><defs><style>@import url(https://fonts.googleapis.com/css?family=Open+Sans:bold,italic,bolditalic%7CPT+Mono);@font-face{font-family:&apos;PT Mono&apos;;font-weight:700;font-style:normal;src:local(&apos;PT MonoBold&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff2) format(&apos;woff2&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff) format(&apos;woff&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.ttf) format(&apos;truetype&apos;)}</style></defs><g id="network" fill="none" fill-rule="evenodd" stroke="none" stroke-width="1"><g id="xhr-another-domain.svg"><path id="Rectangle-227" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M1 16h128v64H1z"/><text id="JavaScript" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="35" y="50">JavaScript</tspan></text><path id="Rectangle-228" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M261 16h128v64H261z"/><text id="Browser" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="296" y="50">Browser</tspan></text><path id="Rectangle-229" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M504 16h128v64H504z"/><text id="Server" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="544" y="50">Server</tspan></text><path id="Line" stroke="#979797" stroke-linecap="square" d="M66 81v320M326 81v320M569 81v320"/><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M312 133l14 7-14 7v-6H66v-2h246v-6z"/><text id="Origin:-https://java" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="354.313" y="205">Origin: https://javascript.info</tspan></text><text id="HTTP-request" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="401.015" y="174">HTTP-request</tspan></text><text id="fetch()" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="171" y="131">fetch()</tspan></text><text id="HTTP-response" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="398.419" y="250">HTTP-response</tspan></text><text id="Access-Control-Allow" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="355" y="287">Access-Control-Allow-Origin: </tspan> <tspan x="360.13" y="305">* OR https://javascript.info</tspan></text><text id="if-the-header-allows" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="85" y="325">if the header allows, then success,</tspan></text><text id="otherwise-fail" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="148" y="353">otherwise fail</tspan></text><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M554 180l14 7-14 7v-6H328v-2h226v-6z"/><path id="Line-2" fill="#EE6B47" fill-rule="nonzero" d="M340 258v6h228v2H340v6l-14-7 14-7z"/><path id="Line-3" fill="#EE6B47" fill-rule="nonzero" d="M80 326v6h247v2H80v6l-14-7 14-7z"/></g></g></svg>
\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" width="633" height="411" viewBox="0 0 633 411"><defs><style>@import url(https://fonts.googleapis.com/css?family=Open+Sans:bold,italic,bolditalic%7CPT+Mono);@font-face{font-family:&apos;PT Mono&apos;;font-weight:700;font-style:normal;src:local(&apos;PT MonoBold&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff2) format(&apos;woff2&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff) format(&apos;woff&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.ttf) format(&apos;truetype&apos;)}</style></defs><g id="network" fill="none" fill-rule="evenodd" stroke="none" stroke-width="1"><g id="xhr-another-domain.svg"><path id="Rectangle-227" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M1 16h128v64H1z"/><text id="JavaScript" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="35" y="50">JavaScript</tspan></text><path id="Rectangle-228" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M261 16h128v64H261z"/><text id="Browser" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="296" y="50">Browser</tspan></text><path id="Rectangle-229" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M504 16h128v64H504z"/><text id="Server" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="544" y="50">Server</tspan></text><path id="Line" stroke="#979797" stroke-linecap="square" d="M66 81v320M326 81v320M569 81v320"/><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M312 133l14 7-14 7v-6H66v-2h246v-6z"/><text id="Origin:-https://java" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="354.313" y="205">Origin: https://javascript.info</tspan></text><text id="HTTP-request" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="401.015" y="174">HTTP-request</tspan></text><text id="fetch()" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="171" y="131">fetch()</tspan></text><text id="HTTP-response" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="398.419" y="250">HTTP-response</tspan></text><text id="Access-Control-Allow" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="347.5" y="287">Access-Control-Allow-Origin: * </tspan> <tspan x="364.361" y="305">(or https://javascript.info)</tspan></text><text id="if-the-header-allows" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="85" y="325">if the header allows, then success,</tspan></text><text id="otherwise-fail" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="148" y="353">otherwise fail</tspan></text><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M554 180l14 7-14 7v-6H328v-2h226v-6z"/><path id="Line-2" fill="#EE6B47" fill-rule="nonzero" d="M340 258v6h228v2H340v6l-14-7 14-7z"/><path id="Line-3" fill="#EE6B47" fill-rule="nonzero" d="M80 326v6h247v2H80v6l-14-7 14-7z"/></g></g></svg>
\ No newline at end of file
diff --git a/5-network/05-fetch-crossorigin/xhr-preflight.svg b/5-network/05-fetch-crossorigin/xhr-preflight.svg
index 89e4a1d2e..4ce92b5b1 100644
--- a/5-network/05-fetch-crossorigin/xhr-preflight.svg
+++ b/5-network/05-fetch-crossorigin/xhr-preflight.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="620" height="633" viewBox="0 0 620 633"><defs><style>@import url(https://fonts.googleapis.com/css?family=Open+Sans:bold,italic,bolditalic%7CPT+Mono);@font-face{font-family:&apos;PT Mono&apos;;font-weight:700;font-style:normal;src:local(&apos;PT MonoBold&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff2) format(&apos;woff2&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff) format(&apos;woff&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.ttf) format(&apos;truetype&apos;)}</style></defs><g id="network" fill="none" fill-rule="evenodd" stroke="none" stroke-width="1"><g id="xhr-preflight.svg"><path id="Rectangle-227" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M1 16h128v64H1z"/><text id="JavaScript" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="33" y="50">JavaScript</tspan></text><path id="Rectangle-228" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M240 16h128v64H240z"/><text id="Browser" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="278" y="48">Browser</tspan></text><path id="Rectangle-229" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M491 16h128v64H491z"/><text id="Server" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="534" y="50">Server</tspan></text><path id="Line" stroke="#979797" stroke-linecap="square" d="M66 82v520M305 82v520M556 82v520"/><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M291 133l14 7-14 7-.001-6H67v-2h223.999l.001-6z"/><text id="fetch()" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="166" y="131">fetch()</tspan></text><text id="OPTIONS" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="400" y="173">OPTIONS</tspan></text><text id="Origin-Access-Contro" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="406.581" y="198">Origin</tspan> <tspan x="321.866" y="216">Access-Control-Request-Method</tspan> <tspan x="320" y="234">Access-Control-Request-Headers</tspan></text><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M319 285.5v6h237v2H319v6l-14-7 14-7z"/><text id="200-OK" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="407" y="285">200 OK</tspan></text><path id="Line-4" fill="#EE6B47" fill-rule="nonzero" d="M542 173l14 7-14 7-.001-6H305v-2h236.999l.001-6z"/><path id="Line-2" fill="#EE6B47" fill-rule="nonzero" d="M319 495v6h237v2H319v6l-14-7 14-7z"/><path id="Line-3" fill="#EE6B47" fill-rule="nonzero" d="M90.5 544.5v8h214v3h-214v8l-19-9.5 19-9.5z"/><text id="Access-Control-Allow" fill="#8A704D" font-family="OpenSans-Regular, Open 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font-size="14" font-weight="normal"><tspan x="360" y="429">Main HTTP-request</tspan></text><text id="preflight" fill="#9B9B9B" font-family="OpenSans-Regular, Open Sans" font-size="22" font-weight="normal"><tspan x="210.365" y="186">preflight</tspan></text><text id="if-allowed" fill="#9B9B9B" font-family="OpenSans-Regular, Open Sans" font-size="22" font-weight="normal"><tspan x="198.559" y="441">if allowed</tspan></text><text id="1" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="186">1</tspan></text><text id="2" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="302">2</tspan></text><text id="3" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="443">3</tspan></text><text id="4" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" 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\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" width="620" height="633" viewBox="0 0 620 633"><defs><style>@import url(https://fonts.googleapis.com/css?family=Open+Sans:bold,italic,bolditalic%7CPT+Mono);@font-face{font-family:&apos;PT Mono&apos;;font-weight:700;font-style:normal;src:local(&apos;PT MonoBold&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff2) format(&apos;woff2&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.woff) format(&apos;woff&apos;),url(/https/patch-diff.githubusercontent.com/font/PTMonoBold.ttf) format(&apos;truetype&apos;)}</style></defs><g id="network" fill="none" fill-rule="evenodd" stroke="none" stroke-width="1"><g id="xhr-preflight.svg"><path id="Rectangle-227" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M1 16h128v64H1z"/><text id="JavaScript" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="33" y="50">JavaScript</tspan></text><path id="Rectangle-228" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M240 16h128v64H240z"/><text id="Browser" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="278" y="48">Browser</tspan></text><path id="Rectangle-229" fill="#FFF9EB" stroke="#E8C48E" stroke-width="2" d="M491 16h128v64H491z"/><text id="Server" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="534" y="50">Server</tspan></text><path id="Line" stroke="#979797" stroke-linecap="square" d="M66 82v520M305 82v520M556 82v520"/><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M291 133l14 7-14 7-.001-6H67v-2h223.999l.001-6z"/><text id="fetch()" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="166" y="131">fetch()</tspan></text><text id="OPTIONS" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="400" y="173">OPTIONS</tspan></text><text id="Origin-Access-Contro" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="406.581" y="198">Origin</tspan> <tspan x="321.866" y="216">Access-Control-Request-Method</tspan> <tspan x="320" y="234">Access-Control-Request-Headers</tspan></text><path id="Line" fill="#EE6B47" fill-rule="nonzero" d="M319 285.5v6h237v2H319v6l-14-7 14-7z"/><text id="200-OK" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"><tspan x="407" y="285">200 OK</tspan></text><path id="Line-4" fill="#EE6B47" fill-rule="nonzero" d="M542 173l14 7-14 7-.001-6H305v-2h236.999l.001-6z"/><path id="Line-2" fill="#EE6B47" fill-rule="nonzero" d="M319 495v6h237v2H319v6l-14-7 14-7z"/><path id="Line-3" fill="#EE6B47" fill-rule="nonzero" d="M90.5 544.5v8h214v3h-214v8l-19-9.5 19-9.5z"/><text id="Access-Control-Allow" fill="#8A704D" font-family="OpenSans-Regular, Open 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font-size="14" font-weight="normal"><tspan x="360" y="429">Main HTTP-request</tspan></text><text id="preflight" fill="#9B9B9B" font-family="OpenSans-Regular, Open Sans" font-size="22" font-weight="normal"><tspan x="210.365" y="186">preflight</tspan></text><text id="if-allowed" fill="#9B9B9B" font-family="OpenSans-Regular, Open Sans" font-size="22" font-weight="normal"><tspan x="198.559" y="441">if allowed</tspan></text><text id="1" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="186">1</tspan></text><text id="2" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="302">2</tspan></text><text id="3" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="443">3</tspan></text><text id="4" fill="#000" font-family="OpenSans-Regular, Open Sans" font-size="24" font-weight="normal"><tspan x="570.139" y="509">4</tspan></text><text id="Access-Control-Allow" fill="#8A704D" font-family="OpenSans-Regular, Open Sans" font-size="14" font-weight="normal"> <tspan x="341.417" y="311.33">Access-Control-Allow-Origin</tspan> <tspan x="335.866" y="329.33">Access-Control-Allow-Method</tspan> <tspan x="334" y="347.33">Access-Control-Allow-Headers</tspan> <tspan x="352.83" y="365.33">Access-Control-Max-Age</tspan></text></g></g></svg>
\ No newline at end of file
diff --git a/5-network/06-fetch-api/article.md b/5-network/06-fetch-api/article.md
index edd361e5d..413aa47b0 100644
--- a/5-network/06-fetch-api/article.md
+++ b/5-network/06-fetch-api/article.md
@@ -215,10 +215,10 @@ window.onunload = function() {
 
 Normally, when a document is unloaded, all associated network requests are aborted. But `keepalive` option tells the browser to perform the request in background, even after it leaves the page. So this option is essential for our request to succeed.
 
-It has few limitations:
+It has a few limitations:
 
 - We can't send megabytes: the body limit for `keepalive` requests is 64kb.
-    - If gather more data, we can send it out regularly in packets, so that there won't be a lot left for the last `onunload` request.
-    - The limit is for all currently ongoing requests. So we can't cheat it by creating 100 requests, each 64kb.
-- We can't handle the server response if the request is made in `onunload`, because the document is already unloaded at that time, functions won't work.
-    - Usually, the server sends empty response to such requests, so it's not a problem.
+    - If we need to gather a lot of statistics about the visit, we should send it out regularly in packets, so that there won't be a lot left for the last `onunload` request.
+    - This limit applies to all `keepalive` requests together. In other words, we can perform multiple `keepalive` requests in parallel, but the sum of their body lengths should not exceed 64kb.
+- We can't handle the server response if the document is unloaded. So in our example `fetch` will succeed due to `keepalive`, but subsequent functions  won't work.
+    - In most cases, such as sending out statistics, it's not a problem, as server just accepts the data and usually sends an empty response to such requests.
diff --git a/5-network/07-url/article.md b/5-network/07-url/article.md
index 591a55af2..09a4696e7 100644
--- a/5-network/07-url/article.md
+++ b/5-network/07-url/article.md
@@ -88,7 +88,7 @@ It provides convenient methods for search parameters:
 - **`delete(name)`** -- remove the parameter by `name`,
 - **`get(name)`** -- get the parameter by `name`,
 - **`getAll(name)`** -- get all parameters with the same `name` (that's possible, e.g. `?user=John&user=Pete`),
-- **`has(name)`** -- check for the existance of the parameter by `name`,
+- **`has(name)`** -- check for the existence of the parameter by `name`,
 - **`set(name, value)`** -- set/replace the parameter,
 - **`sort()`** -- sort parameters by name, rarely needed,
 - ...and it's also iterable, similar to `Map`.
@@ -145,10 +145,10 @@ If we use a string though, we need to encode/decode special characters manually.
 
 There are built-in functions for that:
 
-- [encodeURI](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI) - encodes URL as a whole.
-- [decodeURI](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURI) - decodes it back.
-- [encodeURIComponent](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent) - encodes a URL component, such as a search parameter, or a hash, or a pathname.
-- [decodeURIComponent](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent) - decodes it back.
+- [encodeURI](mdn:/JavaScript/Reference/Global_Objects/encodeURI) - encodes URL as a whole.
+- [decodeURI](mdn:/JavaScript/Reference/Global_Objects/decodeURI) - decodes it back.
+- [encodeURIComponent](mdn:/JavaScript/Reference/Global_Objects/encodeURIComponent) - encodes a URL component, such as a search parameter, or a hash, or a pathname.
+- [decodeURIComponent](mdn:/JavaScript/Reference/Global_Objects/decodeURIComponent) - decodes it back.
 
 A natural question is: "What's the difference between `encodeURIComponent` and `encodeURI`? When we should use either?"
 
diff --git a/5-network/08-xmlhttprequest/article.md b/5-network/08-xmlhttprequest/article.md
index 41b18ade0..1a2b754e0 100644
--- a/5-network/08-xmlhttprequest/article.md
+++ b/5-network/08-xmlhttprequest/article.md
@@ -332,7 +332,7 @@ There are 3 methods for HTTP-headers:
 
 ## POST, FormData
 
-To make a POST request, we can use the built-in [FormData](https://developer.mozilla.org/en-US/docs/Web/API/FormData) object.
+To make a POST request, we can use the built-in [FormData](mdn:api/FormData) object.
 
 The syntax:
 
diff --git a/5-network/10-long-polling/article.md b/5-network/10-long-polling/article.md
index 68eec844e..02d21d7a2 100644
--- a/5-network/10-long-polling/article.md
+++ b/5-network/10-long-polling/article.md
@@ -6,7 +6,7 @@ Being very easy to implement, it's also good enough in a lot of cases.
 
 ## Regular Polling
 
-The simplest way to get new information from the server is periodic polling. That is, regular requests to the server: "Hello, I'm here, do you have any information for me?". For example, once in 10 seconds.
+The simplest way to get new information from the server is periodic polling. That is, regular requests to the server: "Hello, I'm here, do you have any information for me?". For example, once every 10 seconds.
 
 In response, the server first takes a notice to itself that the client is online, and second - sends a packet of messages it got till that moment.
 
@@ -70,11 +70,13 @@ As you can see, `subscribe` function makes a fetch, then waits for the response,
 ```warn header="Server should be ok with many pending connections"
 The server architecture must be able to work with many pending connections.
 
-Certain server architectures run a process per connect. For many connections there will be as many processes, and each process takes a lot of memory. So many connections just consume it all.
+Certain server architectures run one process per connection; resulting in there being as many processes as there are connections, while each process consumes quite a bit of memory. So, too many connections will just consume it all.
 
-That's often the case for backends written in PHP, Ruby languages, but technically isn't a language, but rather implementation issue. Most modern language allow to implement a proper backend, but some of them make it easier than the other.
+That's often the case for backends written in languages like PHP and Ruby.
 
-Backends written using Node.js usually don't have such problems.
+Servers written using Node.js usually don't have such problems.
+
+That said, it isn't a programming language issue. Most modern languages, including PHP and Ruby allow to implement a proper backend. Just please make sure that your server architecture works fine with many simultaneous connections.
 ```
 
 ## Demo: a chat
diff --git a/5-network/11-websocket/article.md b/5-network/11-websocket/article.md
index b3a3b4b03..b374c2b70 100644
--- a/5-network/11-websocket/article.md
+++ b/5-network/11-websocket/article.md
@@ -177,12 +177,12 @@ A call `socket.send(body)` allows `body` in string or a binary format, including
 
 **When we receive the data, text always comes as string. And for binary data, we can choose between `Blob` and `ArrayBuffer` formats.**
 
-That's set by `socket.bufferType` property, it's `"blob"` by default, so binary data comes as `Blob` objects.
+That's set by `socket.binaryType` property, it's `"blob"` by default, so binary data comes as `Blob` objects.
 
 [Blob](info:blob) is a high-level binary object, it directly integrates with `<a>`, `<img>` and other tags, so that's a sane default. But for binary processing, to access individual data bytes, we can change it to `"arraybuffer"`:
 
 ```js
-socket.bufferType = "arraybuffer";
+socket.binaryType = "arraybuffer";
 socket.onmessage = (event) => {
   // event.data is either a string (if text) or arraybuffer (if binary)
 };
diff --git a/6-data-storage/01-cookie/article.md b/6-data-storage/01-cookie/article.md
index 5f18f216b..3bce4cf3a 100644
--- a/6-data-storage/01-cookie/article.md
+++ b/6-data-storage/01-cookie/article.md
@@ -68,7 +68,7 @@ alert(document.cookie); // ...; my%20name=John%20Smith
 
 ```warn header="Limitations"
 There are few limitations:
-- The `name=value` pair, after `encodeURIComponent`, should not exceed 4kb. So we can't store anything huge in a cookie.
+- The `name=value` pair, after `encodeURIComponent`, should not exceed 4KB. So we can't store anything huge in a cookie.
 - The total number of cookies per domain is limited to around 20+, the exact limit depends on a browser.
 ```
 
@@ -415,7 +415,7 @@ GDPR is not only about cookies, it's about other privacy-related issues too, but
 `document.cookie` provides access to cookies
 - write operations modify only cookies mentioned in it.
 - name/value must be encoded.
-- one cookie up to 4kb, 20+ cookies per site (depends on a browser).
+- one cookie up to 4KB, 20+ cookies per site (depends on a browser).
 
 Cookie options:
 - `path=/`, by default current path, makes the cookie visible only under that path.
diff --git a/6-data-storage/02-localstorage/article.md b/6-data-storage/02-localstorage/article.md
index 3ba9aa972..65d3002a4 100644
--- a/6-data-storage/02-localstorage/article.md
+++ b/6-data-storage/02-localstorage/article.md
@@ -216,13 +216,13 @@ Also, `event.storageArea` contains the storage object -- the event is the same f
 
 **That allows different windows from the same origin to exchange messages.**
 
-Modern browsers also support [Broadcast channel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API), the special API for same-origin inter-window communication, it's more full featured, but less supported. There are libraries that polyfill that API, based on `localStorage`, that make it available everywhere.
+Modern browsers also support [Broadcast channel API](mdn:/api/Broadcast_Channel_API), the special API for same-origin inter-window communication, it's more full featured, but less supported. There are libraries that polyfill that API, based on `localStorage`, that make it available everywhere.
 
 ## Summary
 
 Web storage objects `localStorage` and `sessionStorage` allow to store key/value in the browser.
 - Both `key` and `value` must be strings.
-- The limit is 2mb+, depends on the browser.
+- The limit is 5mb+, depends on the browser.
 - They do not expire.
 - The data is bound to the origin (domain/port/protocol).
 
diff --git a/6-data-storage/03-indexeddb/article.md b/6-data-storage/03-indexeddb/article.md
index 3f0cf0e5a..af39d2c49 100644
--- a/6-data-storage/03-indexeddb/article.md
+++ b/6-data-storage/03-indexeddb/article.md
@@ -16,7 +16,7 @@ That power is usually excessive for traditional client-server apps. IndexedDB is
 
 The native interface to IndexedDB, described in the specification <https://www.w3.org/TR/IndexedDB>, is event-based.
 
-We can also use `async/await` with the help of a promise-based wrapper, like <https://github.com/jakearchibald/idb>. That's pretty convenient, but the wrapper is not perfect, it can't replace events for all cases. So we'll start with events, and then, after we gain understanding of IndexedDb, we'll use the wrapper.
+We can also use `async/await` with the help of a promise-based wrapper, like <https://github.com/jakearchibald/idb>. That's pretty convenient, but the wrapper is not perfect, it can't replace events for all cases. So we'll start with events, and then, after we gain an understanding of IndexedDb, we'll use the wrapper.
 
 ## Open database
 
@@ -31,7 +31,7 @@ let openRequest = indexedDB.open(name, version);
 - `name` -- a string, the database name.
 - `version` -- a positive integer version, by default `1` (explained below).
 
-We can have many databases with different names, but all of them exist within the current origin (domain/protocol/port). Different websites can't access databases of each other.
+We can have many databases with different names, but all of them exist within the current origin (domain/protocol/port). Different websites can't access each other's databases.
 
 The call returns `openRequest` object, we should listen to events on it:
 - `success`: database is ready, there's the "database object" in `openRequest.result`, that we should use it for further calls.
@@ -40,15 +40,15 @@ The call returns `openRequest` object, we should listen to events on it:
 
 **IndexedDB has a built-in mechanism of "schema versioning", absent in server-side databases.**
 
-Unlike server-side databases, IndexedDB is client-side, the data is stored in the browser, so we, developers, don't have "any time" access to it. So, when we published a new version of our app, and the user visits our webpage, we may need to update the database.
+Unlike server-side databases, IndexedDB is client-side, the data is stored in the browser, so we, developers, don't have full-time access to it. So, when we have published a new version of our app, and the user visits our webpage, we may need to update the database.
 
 If the local database version is less than specified in `open`, then a special event `upgradeneeded` is triggered, and we can compare versions and upgrade data structures as needed.
 
-The `upgradeneeded` event also triggers when the database did not exist yet (technically, it's version is `0`), so we can perform initialization.
+The `upgradeneeded` event also triggers when the database doesn't yet exist (technically, it's version is `0`), so we can perform the initialization.
 
 Let's say we published the first version of our app.
 
-Then we can open the database with version `1` and perform the initialization in `upgradeneeded` handler like this:
+Then we can open the database with version `1` and perform the initialization in an `upgradeneeded` handler like this:
 
 ```js
 let openRequest = indexedDB.open("store", *!*1*/!*);
@@ -64,7 +64,7 @@ openRequest.onerror = function() {
 
 openRequest.onsuccess = function() {
   let db = openRequest.result;
-  // continue to work with database using db object
+  // continue working with database using db object
 };
 ```
 
@@ -89,7 +89,7 @@ openRequest.onupgradeneeded = function(event) {
 };
 ```
 
-Please note: as our current version is `2`, `onupgradeneeded` handler has a code branch for version `0`, suitable for users that come for the first time and have no database, and also for version `1`, for upgrades.
+Please note: as our current version is `2`, `onupgradeneeded` handler has a code branch for version `0`, suitable for users that are accessing for the first time and have no database, and also for version `1`, for upgrades.
 
 And then, only if `onupgradeneeded` handler finishes without errors, `openRequest.onsuccess` triggers, and the database is considered successfully opened.
 
@@ -103,9 +103,9 @@ let deleteRequest = indexedDB.deleteDatabase(name)
 ```warn header="We can't open an older version of the database"
 If the current user database has a higher version than in the `open` call, e.g. the existing DB version is `3`, and we try to `open(...2)`, then that's an error, `openRequest.onerror` triggers.
 
-That's odd, but such thing may happen when a visitor loaded an outdated JavaScript code, e.g. from a proxy cache. So the code is old, but his database is new.
+That's rare, but such a thing may happen when a visitor loads outdated JavaScript code, e.g. from a proxy cache. So the code is old, but his database is new.
 
-To protect from errors, we should check `db.version` and suggest him to reload the page. Use proper HTTP caching headers to avoid loading the old code, so that you'll never have such problem.
+To protect from errors, we should check `db.version` and suggest a page reload. Use proper HTTP caching headers to avoid loading the old code, so that you'll never have such problems.
 ```
 
 ### Parallel update problem
@@ -121,13 +121,13 @@ So there's a tab with an open connection to DB version `1`, while the second tab
 
 The problem is that a database is shared between two tabs, as it's the same site, same origin. And it can't be both version `1` and `2`. To perform the update to version `2`, all connections to version 1 must be closed, including the one in the first tab.
 
-In order to organize that, the `versionchange` event triggers in such case on the "outdated" database object. We should listen to it and close the old database connection (and probably suggest the visitor to reload the page, to load the updated code).
+In order to organize that, the `versionchange` event triggers on the "outdated" database object. We should listen for it and close the old database connection (and probably suggest a page reload, to load the updated code).
 
-If we don't listen to `versionchange` event and don't close the old connection, then the second, new connection won't be made. The `openRequest` object will emit the `blocked` event instead of `success`. So the second tab won't work.
+If we don't listen for the `versionchange` event and don't close the old connection, then the second, new connection won't be made. The `openRequest` object will emit the `blocked` event instead of `success`. So the second tab won't work.
 
 Here's the code to correctly handle the parallel upgrade.
 
-It installs `onversionchange` handler after the database is opened, that closes the old connection:
+It installs an `onversionchange` handler after the database is opened, that closes the old connection:
 
 ```js
 let openRequest = indexedDB.open("store", 2);
@@ -163,9 +163,9 @@ Here we do two things:
 1. Add `db.onversionchange` listener after a successful opening, to be informed about a parallel update attempt.
 2. Add `openRequest.onblocked` listener to handle the case when an old connection wasn't closed. This doesn't happen if we close it in `db.onversionchange`.
 
-There are other variants. For example, we can take time to close things gracefully in `db.onversionchange`, prompt the visitor to save the data before the connection is closed. The new updating connection will be blocked immediatelly after `db.onversionchange` finished without closing, and we can ask the visitor in the new tab to close other tabs for the update.
+There are other variants. For example, we can take the time to close things gracefully in `db.onversionchange`, and prompt the visitor to save the data before the connection is closed. The new updating connection will be blocked immediately after `db.onversionchange` has finished without closing, and we can ask the visitor in the new tab to close other tabs for the update.
 
-Such update collision happens rarely, but we should at least have some handling for it, e.g. `onblocked` handler, so that our script doesn't surprise the user by dying silently.
+These update collisions happen rarely, but we should at least have some handling for them, e.g. `onblocked` handler, so that our script doesn't surprise the user by dying silently.
 
 ## Object store
 
@@ -179,16 +179,16 @@ Despite being named an "object store", primitives can be stored too.
 
 IndexedDB uses the [standard serialization algorithm](https://www.w3.org/TR/html53/infrastructure.html#section-structuredserializeforstorage) to clone-and-store an object. It's like `JSON.stringify`, but more powerful, capable of storing much more datatypes.
 
-An example of object that can't be stored: an object with circular references. Such objects are not serializable. `JSON.stringify` also fails for such objects.
+An example of an object that can't be stored: an object with circular references. Such objects are not serializable. `JSON.stringify` also fails for such objects.
 
 **There must be a unique `key` for every value in the store.**     
 
-A key must have a type one of: number, date, string, binary, or array. It's an unique identifier: we can search/remove/update values by the key.
+A key must be one of the these types - number, date, string, binary, or array. It's a unique identifier, so we can search/remove/update values by the key.
 
 ![](indexeddb-structure.svg)
 
 
-As we'll see very soon, we can provide a key when we add a value to the store, similar to `localStorage`. But when we store objects, IndexedDB allows to setup an object property as the key, that's much more convenient. Or we can auto-generate keys.
+As we'll see very soon, we can provide a key when we add a value to the store, similar to `localStorage`. But when we store objects, IndexedDB allows setting up an object property as the key, which is much more convenient. Or we can auto-generate keys.
 
 But we need to create an object store first.
 
@@ -214,9 +214,9 @@ db.createObjectStore('books', {keyPath: 'id'});
 
 **An object store can only be created/modified while updating the DB version, in `upgradeneeded` handler.**
 
-That's a technical limitation. Outside of the handler we'll be able to add/remove/update the data, but object stores can be created/removed/altered only during version update.
+That's a technical limitation. Outside of the handler we'll be able to add/remove/update the data, but object stores can only be created/removed/altered during a version update.
 
-To perform database version upgrade, there are two main approaches:
+To perform a database version upgrade, there are two main approaches:
 1. We can implement per-version upgrade functions: from 1 to 2, from 2 to 3, from 3 to 4 etc. Then, in `upgradeneeded` we can compare versions (e.g. old 2, now 4) and run per-version upgrades step by step, for every intermediate version (2 to 3, then 3 to 4).
 2. Or we can just examine the database: get a list of existing object stores as `db.objectStoreNames`. That object is a [DOMStringList](https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#domstringlist) that provides `contains(name)` method to check for existance. And then we can do updates depending on what exists and what doesn't.
 
@@ -249,7 +249,7 @@ The term "transaction" is generic, used in many kinds of databases.
 
 A transaction is a group operations, that should either all succeed or all fail.
 
-For instance, when a person buys something, we need:
+For instance, when a person buys something, we need to:
 1. Subtract the money from their account.
 2. Add the item to their inventory.
 
@@ -261,7 +261,7 @@ Transactions can guarantee that.
 
 To start a transaction:
 
-```js run
+```js
 db.transaction(store[, type]);
 ```
 
@@ -272,10 +272,10 @@ db.transaction(store[, type]);
 
 There's also `versionchange` transaction type: such transactions can do everything, but we can't create them manually. IndexedDB automatically creates a `versionchange` transaction when opening the database, for `updateneeded` handler. That's why it's a single place where we can update the database structure, create/remove object stores.
 
-```smart header="Why there exist different types of transactions?"
+```smart header="Why are there different types of transactions?"
 Performance is the reason why transactions need to be labeled either `readonly` and `readwrite`.
 
-Many `readonly` transactions are able to access concurrently the same store, but `readwrite` transactions can't. A `readwrite` transaction "locks" the store for writing. The next transaction must wait before the previous one finishes before accessing the same store.
+Many `readonly` transactions are able to access the same store concurrently, but `readwrite` transactions can't. A `readwrite` transaction "locks" the store for writing. The next transaction must wait before the previous one finishes before accessing the same store.
 ```
 
 After the transaction is created, we can add an item to the store, like this:
@@ -309,7 +309,7 @@ request.onerror = function() {
 
 There were basically four steps:
 
-1. Create a transaction, mention all stores it's going to access, at `(1)`.
+1. Create a transaction, mentioning all the stores it's going to access, at `(1)`.
 2. Get the store object using `transaction.objectStore(name)`, at `(2)`.
 3. Perform the request to the object store `books.add(book)`, at `(3)`.
 4. ...Handle request success/error `(4)`, then we can make other requests if needed, etc.
@@ -317,7 +317,7 @@ There were basically four steps:
 Object stores support two methods to store a value:
 
 - **put(value, [key])**
-    Add the `value` to the store. The `key` is supplied only if the object store did not have `keyPath` or `autoIncrement` option. If there's already a value with same key, it will be replaced.
+    Add the `value` to the store. The `key` is supplied only if the object store did not have `keyPath` or `autoIncrement` option. If there's already a value with the same key, it will be replaced.
 
 - **add(value, [key])**
     Same as `put`, but if there's already a value with the same key, then the request fails, and an error with the name `"ConstraintError"` is generated.
@@ -329,7 +329,7 @@ Similar to opening a database, we can send a request: `books.add(book)`, and the
 
 ## Transactions' autocommit
 
-In the example above we started the transaction and made `add` request. But as we stated previously, a transaction may have multiple associated requests, that must either all success or all fail. How do we mark the transaction as finished, no more requests to come?
+In the example above we started the transaction and made `add` request. But as we stated previously, a transaction may have multiple associated requests, that must either all succeed or all fail. How do we mark the transaction as finished, with no more requests to come?
 
 The short answer is: we don't.
 
@@ -343,7 +343,7 @@ So, in the example above no special call is needed to finish the transaction.
 
 Transactions auto-commit principle has an important side effect. We can't insert an async operation like `fetch`, `setTimeout` in the middle of transaction. IndexedDB will not keep the transaction waiting till these are done.
 
-In the code below `request2` in line `(*)` fails, because the transaction is already committed, can't make any request in it:
+In the code below, `request2` in line `(*)` fails, because the transaction is already committed, and can't make any request in it:
 
 ```js
 let request1 = books.add(book);
@@ -551,7 +551,7 @@ openRequest.onupgradeneeded = function() {
   // we must create the index here, in versionchange transaction
   let books = db.createObjectStore('books', {keyPath: 'id'});
 *!*
-  let index = inventory.createIndex('price_idx', 'price');
+  let index = books.createIndex('price_idx', 'price');
 */!*
 };
 ```
@@ -698,7 +698,7 @@ let request = priceIdx.openCursor(IDBKeyRange.upperBound(5));
 request.onsuccess = function() {
   let cursor = request.result;
   if (cursor) {
-    let key = cursor.primaryKey; // next object store key (id field)
+    let primaryKey = cursor.primaryKey; // next object store key (id field)
     let value = cursor.value; // next object store object (book object)
     let key = cursor.key; // next index key (price)
     console.log(key, value);
@@ -718,7 +718,7 @@ Let's use a thin promise wrapper <https://github.com/jakearchibald/idb> further
 Then, instead of `onsuccess/onerror` we can write like this:
 
 ```js
-let db = await idb.openDb('store', 1, db => {
+let db = await idb.openDB('store', 1, db => {
   if (db.oldVersion == 0) {
     // perform the initialization
     db.createObjectStore('books', {keyPath: 'id'});
diff --git a/8-web-components/2-custom-elements/article.md b/8-web-components/2-custom-elements/article.md
index 702ff9073..5a07cc679 100644
--- a/8-web-components/2-custom-elements/article.md
+++ b/8-web-components/2-custom-elements/article.md
@@ -115,7 +115,7 @@ customElements.define("time-formatted", TimeFormatted); // (2)
 ></time-formatted>
 ```
 
-1. The class has only one method `connectedCallback()` -- the browser calls it when `<time-formatted>` element is added to page (or when HTML parser detects it), and it uses the built-in [Intl.DateTimeFormat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat) data formatter, well-supported across the browsers, to show a nicely formatted time.
+1. The class has only one method `connectedCallback()` -- the browser calls it when `<time-formatted>` element is added to page (or when HTML parser detects it), and it uses the built-in [Intl.DateTimeFormat](mdn:/JavaScript/Reference/Global_Objects/DateTimeFormat) data formatter, well-supported across the browsers, to show a nicely formatted time.
 2. We need to register our new element by `customElements.define(tag, class)`.
 3. And then we can use it everywhere.
 
diff --git a/8-web-components/6-shadow-dom-style/article.md b/8-web-components/6-shadow-dom-style/article.md
index 2be81fbb2..83a6962fa 100644
--- a/8-web-components/6-shadow-dom-style/article.md
+++ b/8-web-components/6-shadow-dom-style/article.md
@@ -259,7 +259,6 @@ For example, in shadow DOM we can use `--user-card-field-color` CSS variable to
 </style>
 <div class="field">Name: <slot name="username"></slot></div>
 <div class="field">Birthday: <slot name="birthday"></slot></div>
-</style>
 ```
 
 Then, we can declare this property in the outer document for `<user-card>`:
diff --git a/9-regular-expressions/02-regexp-character-classes/article.md b/9-regular-expressions/02-regexp-character-classes/article.md
index 7baa6984b..93552a2b0 100644
--- a/9-regular-expressions/02-regexp-character-classes/article.md
+++ b/9-regular-expressions/02-regexp-character-classes/article.md
@@ -120,7 +120,7 @@ alert( "CS-4".match(regexp) ); // CS-4
 alert( "CS 4".match(regexp) ); // CS 4 (space is also a character)
 ```
 
-Please note that a dot means "any character", but not the "absense of a character". There must be a character to match it:
+Please note that a dot means "any character", but not the "absence of a character". There must be a character to match it:
 
 ```js run
 alert( "CS4".match(/CS.4/) ); // null, no match because there's no character for the dot
diff --git a/9-regular-expressions/03-regexp-unicode/article.md b/9-regular-expressions/03-regexp-unicode/article.md
index defbe15ab..60d85ff13 100644
--- a/9-regular-expressions/03-regexp-unicode/article.md
+++ b/9-regular-expressions/03-regexp-unicode/article.md
@@ -33,12 +33,6 @@ Unlike strings, regular expressions have flag `pattern:u` that fixes such proble
 
 ## Unicode properties \p{...}
 
-```warn header="Not supported in Firefox and Edge"
-Despite being a part of the standard since 2018, unicode properties are not supported in Firefox ([bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1361876)) and Edge ([bug](https://github.com/Microsoft/ChakraCore/issues/2969)).
-
-There's [XRegExp](http://xregexp.com) library that provides "extended" regular expressions with cross-browser support for unicode properties.
-```
-
 Every character in Unicode has a lot of properties. They describe what "category" the character belongs to, contain miscellaneous information about it.
 
 For instance, if a character has `Letter` property, it means that the character belongs to an alphabet (of any language). And `Number` property means that it's a digit: maybe Arabic or Chinese, and so on.
diff --git a/9-regular-expressions/15-regexp-catastrophic-backtracking/article.md b/9-regular-expressions/15-regexp-catastrophic-backtracking/article.md
index 59467f938..c66a1a219 100644
--- a/9-regular-expressions/15-regexp-catastrophic-backtracking/article.md
+++ b/9-regular-expressions/15-regexp-catastrophic-backtracking/article.md
@@ -1,20 +1,20 @@
 # Catastrophic backtracking
 
-Some regular expressions are looking simple, but can execute veeeeeery long time, and even "hang" the JavaScript engine.
+Some regular expressions are looking simple, but can execute a veeeeeery long time, and even "hang" the JavaScript engine.
 
-Sooner or later most developers occasionally face such behavior, because it's quite easy to create such a regexp.
-
-The typical symptom -- a regular expression works fine sometimes, but for certain strings it "hangs", consuming 100% of CPU.
+Sooner or later most developers occasionally face such behavior. The typical symptom -- a regular expression works fine sometimes, but for certain strings it "hangs", consuming 100% of CPU.
 
 In such case a web-browser suggests to kill the script and reload the page. Not a good thing for sure.
 
-For server-side JavaScript it may become a vulnerability if regular expressions process user data.
+For server-side JavaScript such a regexp may hang the server process, that's even worse. So we definitely should take a look at it.
 
 ## Example
 
-Let's say we have a string, and we'd like to check if it consists of words  `pattern:\w+` with an optional space `pattern:\s?` after each.
+Let's say we have a string, and we'd like to check if it consists of words `pattern:\w+` with an optional space `pattern:\s?` after each.
+
+An obvious way to construct a regexp would be to take a word followed by an optional space `pattern:\w+\s?` and then repeat it with `*`.
 
-We'll use a regexp `pattern:^(\w+\s?)*$`, it specifies 0 or more such words.
+That leads us to the regexp `pattern:^(\w+\s?)*$`, it specifies zero or more such words, that start at the beginning `pattern:^` and finish at the end `pattern:$` of the line.
 
 In action:
 
@@ -25,9 +25,9 @@ alert( regexp.test("A good string") ); // true
 alert( regexp.test("Bad characters: $@#") ); // false
 ```
 
-It seems to work. The result is correct. Although, on certain strings it takes a lot of time. So long that JavaScript engine "hangs" with 100% CPU consumption.
+The regexp seems to work. The result is correct. Although, on certain strings it takes a lot of time. So long that JavaScript engine "hangs" with 100% CPU consumption.
 
-If you run the example below, you probably won't see anything, as JavaScript will just "hang". A web-browser will stop reacting on events, the UI will stop working. After some time it will suggest to reloaad the page. So be careful with this:
+If you run the example below, you probably won't see anything, as JavaScript will just "hang". A web-browser will stop reacting on events, the UI will stop working (most browsers allow only scrolling). After some time it will suggest to reload the page. So be careful with this:
 
 ```js run
 let regexp = /^(\w+\s?)*$/;
@@ -37,24 +37,22 @@ let str = "An input string that takes a long time or even makes this regexp to h
 alert( regexp.test(str) );
 ```
 
-Some regular expression engines can handle such search, but most of them can't.
+To be fair, let's note that some regular expression engines can handle such a search effectively. But most of them can't. Browser engines usually hang.
 
 ## Simplified example
 
-What's the matter? Why the regular expression "hangs"?
+What's the matter? Why the regular expression hangs?
 
 To understand that, let's simplify the example: remove spaces `pattern:\s?`. Then it becomes `pattern:^(\w+)*$`.
 
 And, to make things more obvious, let's replace `pattern:\w` with `pattern:\d`. The resulting regular expression still hangs, for instance:
 
-<!-- let str = `AnInputStringThatMakesItHang!`; -->
-
 ```js run
 let regexp = /^(\d+)*$/;
 
-let str = "012345678901234567890123456789!";
+let str = "012345678901234567890123456789z";
 
-// will take a very long time
+// will take a very long time (careful!)
 alert( regexp.test(str) );
 ```
 
@@ -62,45 +60,49 @@ So what's wrong with the regexp?
 
 First, one may notice that the regexp `pattern:(\d+)*` is a little bit strange. The quantifier `pattern:*` looks extraneous. If we want a number, we can use `pattern:\d+`.
 
-Indeed, the regexp is artificial. But the reason why it is slow is the same as those we saw above. So let's understand it, and then the previous example will become obvious.
+Indeed, the regexp is artificial, we got it by simplifying the previous example. But the reason why it is slow is the same. So let's understand it, and then the previous example will become obvious.
 
-What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456789!` (shortened a bit for clarity), why does it take so long?
+What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456789z` (shortened a bit for clarity, please note a non-digit character `subject:z` at the end, it's important), why does it take so long?
 
-1. First, the regexp engine tries to find a number `pattern:\d+`. The plus `pattern:+` is greedy by default, so it consumes all digits:
+Here's what the regexp engine does:
+
+1. First, the regexp engine tries to find the content of the parentheses: the number `pattern:\d+`. The plus `pattern:+` is greedy by default, so it consumes all digits:
 
     ```
     \d+.......
     (123456789)z
     ```
 
-    Then it tries to apply the star quantifier, but there are no more digits, so it the star doesn't give anything.
+    After all digits are consumed, `pattern:\d+` is considered found (as `match:123456789`).
+    
+    Then the star quantifier `pattern:(\d+)*` applies. But there are no more digits in the text, so the star doesn't give anything.
 
-    The next in the pattern is the string end `pattern:$`, but in the text we have `subject:!`, so there's no match:
+    The next character in the pattern is the string end `pattern:$`. But in the text we have `subject:z` instead, so there's no match:
 
     ```
                X
     \d+........$
-    (123456789)!
+    (123456789)z
     ```
 
 2. As there's no match, the greedy quantifier `pattern:+` decreases the count of repetitions, backtracks one character back.
 
-    Now `pattern:\d+` takes all digits except the last one:
+    Now `pattern:\d+` takes all digits except the last one (`match:12345678`):
     ```
     \d+.......
-    (12345678)9!
+    (12345678)9z
     ```
-3. Then the engine tries to continue the search from the new position (`9`).
+3. Then the engine tries to continue the search from the next position (right after `match:12345678`).
 
-    The star `pattern:(\d+)*` can be applied -- it gives the number `match:9`:
+    The star `pattern:(\d+)*` can be applied -- it gives one more match of `pattern:\d+`, the number `match:9`:
 
     ```
 
     \d+.......\d+
-    (12345678)(9)!
+    (12345678)(9)z
     ```
 
-    The engine tries to match `pattern:$` again, but fails, because meets `subject:!`:
+    The engine tries to match `pattern:$` again, but fails, because it meets `subject:z` instead:
 
     ```
                  X
@@ -118,7 +120,7 @@ What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456
     ```
                  X
     \d+......\d+
-    (1234567)(89)!
+    (1234567)(89)z
     ```
 
     The first number has 7 digits, and then two numbers of 1 digit each:
@@ -126,7 +128,7 @@ What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456
     ```
                    X
     \d+......\d+\d+
-    (1234567)(8)(9)!
+    (1234567)(8)(9)z
     ```
 
     The first number has 6 digits, and then a number of 3 digits:
@@ -134,7 +136,7 @@ What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456
     ```
                  X
     \d+.......\d+
-    (123456)(789)!
+    (123456)(789)z
     ```
 
     The first number has 6 digits, and then 2 numbers:
@@ -142,23 +144,19 @@ What happens during the search of `pattern:^(\d+)*$` in the line `subject:123456
     ```
                    X
     \d+.....\d+ \d+
-    (123456)(78)(9)!
+    (123456)(78)(9)z
     ```
 
     ...And so on.
 
 
-There are many ways to split a set of digits `123456789` into numbers. To be precise, there are <code>2<sup>n</sup>-1</code>, where `n` is the length of the set.
+There are many ways to split a sequence of digits `123456789` into numbers. To be precise, there are <code>2<sup>n</sup>-1</code>, where `n` is the length of the sequence.
 
-For `n=20` there are about 1 million combinations, for `n=30` - a thousand times more. Trying each of them is exactly the reason why the search takes so long.
+- For `123456789` we have `n=9`, that gives 511 combinations.
+- For a longer sequence with `n=20` there are about one million (1048575) combinations.
+- For `n=30` - a thousand times more (1073741823 combinations).
 
-What to do?
-
-Should we turn on the lazy mode?
-
-Unfortunately, that won't help: if we replace `pattern:\d+` with `pattern:\d+?`, the regexp will still hang. The order of combinations will change, but not their total count.
-
-Some regular expression engines have tricky tests and finite automations that allow to avoid going through all combinations or make it much faster, but not all engines, and not in all cases.
+Trying each of them is exactly the reason why the search takes so long.
 
 ## Back to words and strings
 
@@ -176,7 +174,15 @@ The reason is that a word can be represented as one `pattern:\w+` or many:
 
 For a human, it's obvious that there may be no match, because the string ends with an exclamation sign `!`, but the regular expression expects a wordly character `pattern:\w` or a space `pattern:\s` at the end. But the engine doesn't know that.
 
-It tries all combinations of how the regexp `pattern:(\w+\s?)*` can "consume" the string, including variants with spaces `pattern:(\w+\s)*` and without them `pattern:(\w+)*` (because spaces `pattern:\s?` are optional). As there are many such combinations, the search takes a lot of time.
+It tries all combinations of how the regexp `pattern:(\w+\s?)*` can "consume" the string, including variants with spaces `pattern:(\w+\s)*` and without them `pattern:(\w+)*` (because spaces `pattern:\s?` are optional). As there are many such combinations (we've seen it with digits), the search takes a lot of time.
+
+What to do?
+
+Should we turn on the lazy mode?
+
+Unfortunately, that won't help: if we replace `pattern:\w+` with `pattern:\w+?`, the regexp will still hang. The order of combinations will change, but not their total count.
+
+Some regular expression engines have tricky tests and finite automations that allow to avoid going through all combinations or make it much faster, but most engines don't, and it doesn't always help.
 
 ## How to fix?
 
@@ -184,7 +190,7 @@ There are two main approaches to fixing the problem.
 
 The first is to lower the number of possible combinations.
 
-Let's rewrite the regular expression as `pattern:^(\w+\s)*\w*` - we'll look for any number of words followed by a space `pattern:(\w+\s)*`, and then (optionally) a word `pattern:\w*`.
+Let's make the space non-optional by rewriting the regular expression as `pattern:^(\w+\s)*\w*$` - we'll look for any number of words followed by a space `pattern:(\w+\s)*`, and then (optionally) a final word `pattern:\w*`.
 
 This regexp is equivalent to the previous one (matches the same) and works well:
 
@@ -197,26 +203,30 @@ alert( regexp.test(str) ); // false
 
 Why did the problem disappear?
 
-Now the star `pattern:*` goes after `pattern:\w+\s` instead of `pattern:\w+\s?`. It became impossible to represent one word of the string with multiple successive `pattern:\w+`. The time needed to try such combinations is now saved.
+That's because now the space is mandatory.
 
-For example, the previous pattern `pattern:(\w+\s?)*` could match the word `subject:string` as two `pattern:\w+`:
+The previous regexp, if we omit the space, becomes `pattern:(\w+)*`, leading to many combinations of `\w+` within a single word
+
+So `subject:input` could be matched as two repetitions of `pattern:\w+`, like this:
 
-```js run
-\w+\w+
-string
+```
+\w+  \w+
+(inp)(ut)
 ```
 
-The previous pattern, due to the optional `pattern:\s` allowed variants `pattern:\w+`, `pattern:\w+\s`, `pattern:\w+\w+` and so on.
+The new pattern is different: `pattern:(\w+\s)*` specifies repetitions of words followed by a space! The `subject:input` string can't be matched as two repetitions of `pattern:\w+\s`, because the space is mandatory.
 
-With the rewritten pattern `pattern:(\w+\s)*`, that's impossible: there may be  `pattern:\w+\s` or `pattern:\w+\s\w+\s`, but not `pattern:\w+\w+`. So the overall combinations count is greatly decreased.
+The time needed to try a lot of (actually most of) combinations is now saved.
 
 ## Preventing backtracking
 
-It's not always convenient to rewrite a regexp. And it's not always obvious how to do it.
+It's not always convenient to rewrite a regexp though. In the example above it was easy, but it's not always obvious how to do it. 
+
+Besides, a rewritten regexp is usually more complex, and that's not good. Regexps are complex enough without extra efforts.
 
-The alternative approach is to forbid backtracking for the quantifier.
+Luckily, there's an alternative approach. We can forbid backtracking for the quantifier.
 
-The regular expressions engine tries many combinations that are obviously wrong for a human.
+The root of the problem is that the regexp engine tries many combinations that are obviously wrong for a human.
 
 E.g. in the regexp `pattern:(\d+)*$` it's obvious for a human, that `pattern:+` shouldn't backtrack. If we replace one `pattern:\d+` with two separate `pattern:\d+\d+`, nothing changes:
 
@@ -230,19 +240,26 @@ E.g. in the regexp `pattern:(\d+)*$` it's obvious for a human, that `pattern:+`
 
 And in the original example `pattern:^(\w+\s?)*$` we may want to forbid backtracking in `pattern:\w+`. That is: `pattern:\w+` should match a whole word, with the maximal possible length. There's no need to lower the repetitions count in `pattern:\w+`, try to split it into two words `pattern:\w+\w+` and so on.
 
-Modern regular expression engines support possessive quantifiers for that. They are like greedy ones, but don't backtrack (so they are actually simpler than regular quantifiers).
+Modern regular expression engines support possessive quantifiers for that. Regular quantifiers become possessive if we add `pattern:+` after them. That is, we use `pattern:\d++` instead of `pattern:\d+` to stop `pattern:+` from backtracking.
+
+Possessive quantifiers are in fact simpler than "regular" ones. They just match as many as they can, without any backtracking. The search process without bracktracking is simpler.
 
 There are also so-called "atomic capturing groups" - a way to disable backtracking inside parentheses.
 
-Unfortunately, in JavaScript they are not supported. But there's another way.
+...But the bad news is that, unfortunately, in JavaScript they are not supported. 
+
+We can emulate them though using a "lookahead transform".
 
 ### Lookahead to the rescue!
 
-We can prevent backtracking using lookahead.
+So we've come to real advanced topics. We'd like a quantifier, such as `pattern:+` not to backtrack, because sometimes backtracking makes no sense.
+
+The pattern to take as much repetitions of `pattern:\w` as possible without backtracking is: `pattern:(?=(\w+))\1`. Of course, we could take another pattern instead of `pattern:\w`.
 
-The pattern to take as much repetitions of `pattern:\w` as possible without backtracking is: `pattern:(?=(\w+))\1`.
+That may seem odd, but it's actually a very simple transform.
 
 Let's decipher it:
+
 - Lookahead `pattern:?=` looks forward for the longest word `pattern:\w+` starting at the current position.
 - The contents of parentheses with `pattern:?=...` isn't memorized by the engine, so wrap `pattern:\w+` into parentheses. Then the engine will memorize their contents
 - ...And allow us to reference it in the pattern as `pattern:\1`.
diff --git a/9-regular-expressions/16-regexp-sticky/article.md b/9-regular-expressions/16-regexp-sticky/article.md
index f3650c916..373f3453e 100644
--- a/9-regular-expressions/16-regexp-sticky/article.md
+++ b/9-regular-expressions/16-regexp-sticky/article.md
@@ -3,11 +3,9 @@
 
 The flag `pattern:y` allows to perform the search at the given position in the source string.
 
-To grasp the use case of `pattern:y` flag, and see how great it is, let's explore a practical use case.
+To grasp the use case of `pattern:y` flag, and better understand the ways of regexps, let's explore a practical example.
 
-One of common tasks for regexps is "lexical analysis": we get a text, e.g. in a programming language, and analyze it for structural elements.
-
-For instance, HTML has tags and attributes, JavaScript code has functions, variables, and so on.
+One of common tasks for regexps is "lexical analysis": we get a text, e.g. in a programming language, and need to find its structural elements. For instance, HTML has tags and attributes, JavaScript code has functions, variables, and so on.
 
 Writing lexical analyzers is a special area, with its own tools and algorithms, so we don't go deep in there, but there's a common task: to read something at the given position.
 
@@ -15,24 +13,27 @@ E.g. we have a code string `subject:let varName = "value"`, and we need to read
 
 We'll look for variable name using regexp `pattern:\w+`. Actually, JavaScript variable names need a bit more complex regexp for accurate matching, but here it doesn't matter.
 
-A call to `str.match(/\w+/)` will find only the first word in the line. Or all words with the flag `pattern:g`. But we need only one word at position `4`.
+- A call to `str.match(/\w+/)` will find only the first word in the line (`let`). That's not it.
+- We can add the flag `pattern:g`. But then the call `str.match(/\w+/g)` will look for all words in the text, while we need one word at position `4`. Again, not what we need.
+
+**So, how to search for a regexp exactly at the given position?**
 
-To search from the given position, we can use method `regexp.exec(str)`.
+Let's try using method `regexp.exec(str)`.
 
-If the `regexp` doesn't have flags `pattern:g` or `pattern:y`, then this method looks for the first match in the string `str`, exactly like `str.match(regexp)`. Such simple no-flags case doesn't interest us here.
+For a `regexp` without flags `pattern:g` and `pattern:y`, this method looks only for the first match, it works exactly like `str.match(regexp)`.
 
-If there's flag `pattern:g`, then it performs the search in the string `str`, starting from position stored in its `regexp.lastIndex` property. And, if it finds a match, then sets `regexp.lastIndex` to the index immediately after the match.
+...But if there's flag `pattern:g`, then it performs the search in `str`, starting from position stored in the `regexp.lastIndex` property. And, if it finds a match, then sets `regexp.lastIndex` to the index immediately after the match.
 
-When a regexp is created, its `lastIndex` is `0`.
+In other words, `regexp.lastIndex` serves as a starting point for the search, that each `regexp.exec(str)` call resets to the new value ("after the last match"). That's only if there's `pattern:g` flag, of course.
 
 So, successive calls to `regexp.exec(str)` return matches one after another.
 
-An example (with flag `pattern:g`):
+Here's an example of such calls:
 
 ```js run
-let str = 'let varName';
-
+let str = 'let varName'; // Let's find all words in this string
 let regexp = /\w+/g;
+
 alert(regexp.lastIndex); // 0 (initially lastIndex=0)
 
 let word1 = regexp.exec(str);
@@ -48,8 +49,6 @@ alert(word3); // null (no more matches)
 alert(regexp.lastIndex); // 0 (resets at search end)
 ```
 
-Every match is returned as an array with groups and additional properties.
-
 We can get all matches in the loop:
 
 ```js run
@@ -65,11 +64,13 @@ while (result = regexp.exec(str)) {
 }
 ```
 
-Such use of `regexp.exec` is an alternative to method `str.matchAll`.
+Such use of `regexp.exec` is an alternative to method `str.matchAll`, with a bit more control over the process.
 
-Unlike other methods, we can set our own `lastIndex`, to start the search from the given position.
+Let's go back to our task.
 
-For instance, let's find a word, starting from position `4`:
+We can manually set `lastIndex` to `4`, to start the search from the given position!
+
+Like this:
 
 ```js run
 let str = 'let varName = "value"';
@@ -84,9 +85,15 @@ let word = regexp.exec(str);
 alert(word); // varName
 ```
 
+Hooray! Problem solved! 
+
 We performed a search of `pattern:\w+`, starting from position `regexp.lastIndex = 4`.
 
-Please note: the search starts at position `lastIndex` and then goes further. If there's no word at position `lastIndex`, but it's somewhere after it, then it will be found:
+The result is correct.
+
+...But wait, not so fast.
+
+Please note: the `regexp.exec` call start searching at position `lastIndex` and then goes further. If there's no word at position `lastIndex`, but it's somewhere after it, then it will be found:
 
 ```js run
 let str = 'let varName = "value"';
@@ -94,17 +101,19 @@ let str = 'let varName = "value"';
 let regexp = /\w+/g;
 
 *!*
+// start the search from position 3
 regexp.lastIndex = 3;
 */!*
 
-let word = regexp.exec(str);
+let word = regexp.exec(str); 
+// found the match at position 4
 alert(word[0]); // varName
 alert(word.index); // 4
 ```
 
-...So, with flag `pattern:g` property `lastIndex` sets the starting position for the search.
+For some tasks, including the lexical analysis, that's just wrong. We need to find a match exactly at the given position at the text, not somewhere after it. And that's what the flag `y` is for.
 
-**Flag `pattern:y` makes `regexp.exec` to look exactly at position `lastIndex`, not before, not after it.**
+**The flag `pattern:y` makes `regexp.exec` to search exactly at position `lastIndex`, not "starting from" it.**
 
 Here's the same search with flag `pattern:y`:
 
@@ -122,6 +131,8 @@ alert( regexp.exec(str) ); // varName (word at position 4)
 
 As we can see, regexp `pattern:/\w+/y` doesn't match at position `3` (unlike the flag  `pattern:g`), but matches at position `4`.
 
-Imagine, we have a long text, and there are no matches in it, at all. Then searching with flag `pattern:g` will go till the end of the text, and this will take significantly more time than the search with flag `pattern:y`.
+Not only that's what we need, there's an important performance gain when using flag `pattern:y`.
+
+Imagine, we have a long text, and there are no matches in it, at all. Then a search with flag `pattern:g` will go till the end of the text and find nothing, and this will take significantly more time than the search with flag `pattern:y`, that checks only the exact position.
 
-In such tasks like lexical analysis, there are usually many searches at an exact position. Using flag `pattern:y` is the key for a good performance.
+In tasks like lexical analysis, there are usually many searches at an exact position, to check what we have there. Using flag `pattern:y` is the key for correct implementations and a good performance.
diff --git a/9-regular-expressions/17-regexp-methods/article.md b/9-regular-expressions/17-regexp-methods/article.md
index e4044361f..a7847c0f6 100644
--- a/9-regular-expressions/17-regexp-methods/article.md
+++ b/9-regular-expressions/17-regexp-methods/article.md
@@ -20,7 +20,7 @@ It has 3 modes:
     alert( result.length ); // 2
 
     // Additional information:
-    alert( result.index );  // 0 (match position)
+    alert( result.index );  // 7 (match position)
     alert( result.input );  // I love JavaScript (source string)
     ```
 
diff --git a/README.md b/README.md
index f23979ea4..c6b566b02 100755
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # The Modern JavaScript Tutorial in German
 
+<<<<<<< HEAD
 This repository hosts the translation of <https://javascript.info> in German.
+=======
+This repository hosts the English content of the Modern JavaScript Tutorial, published in [https://javascript.info](https://javascript.info).
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 
 **That's how you can contribute:**
@@ -102,7 +106,13 @@ document.querySelector('.hola').innerHTML = text;
 
 Please note, that sometimes code is followed by pictures, and if you translate text `Hello` -> `Hola` in the code, you need to translate text in picturess as well.
 
+<<<<<<< HEAD
 In that case it's probably easier not to translate such text. See more about translating images later.
+=======
+  - `index.md` stands for a chapter
+  - `article.md` stands for an article
+  - `task.md` stands for a task (solution must be provided in `solution.md` file as well)
+>>>>>>> 23da191b58643387783f38e999f5b05be87d3d93
 
 
 ### External Links
diff --git a/figures.sketch b/figures.sketch
index dfba26425..6ce5e03c0 100644
Binary files a/figures.sketch and b/figures.sketch differ