The document discusses how to plan for future changes in search engine algorithms and rankings. It explains that search engines use algorithms to determine website rankings, with different factors weighted in importance. To prepare for potential changes in these algorithms, the author recommends building websites that incorporate all current and possible future ranking factors, rather than just focusing on current priorities. This includes considerations like keywords, links, page speed, and usability. By taking this broad approach, sites will be well-positioned for algorithm updates that modify the importance of individual criteria.