This document provides a course on punctuation aimed at making the reader an expert punctuation detective. It covers various punctuation marks such as commas, colons, semicolons, dashes, brackets, exclamation points, question marks, apostrophes, quotation marks, and periods. The course contains tasks to test the reader's knowledge of matching punctuation marks to their names and functions, as well as exercises identifying missing punctuation in sentences. It encourages the reader to create a casebook exploring the use and examples of a selected punctuation mark in more detail. Finally, it discusses the effects that punctuation can have on the tone and meaning of text.