This document summarizes key points from the book "Don't Make Me Think" by Steve Krug about designing effective websites. It discusses principles of usability such as eliminating questions for users, keeping tasks within two clicks, and avoiding distractions. Other topics covered include making interactive elements obvious, using visual hierarchies and clearly defined page areas, eliminating unnecessary words, including persistent navigation, and testing usability early and often. The importance of accounting for mobile users and designing accessible mobile versions is also emphasized.