The document discusses the 5 most common AdWords fails and how to fix them. The fails are: 1) using broad match keywords without modifiers which can show ads irrelevantly, 2) not using negative keywords which can also show irrelevant ads, 3) not tracking conversions to measure success, 4) not using all available ad extensions to provide more information to users, and 5) not using remarketing to retarget visitors. The document provides tips on how to address each fail such as using modifiers for broad match keywords, implementing negative keywords, setting up conversion tracking, taking advantage of all ad extension types, and following best practices for remarketing ads.