This document discusses best and worst practices in web usability. It identifies several poor practices such as assuming icons alone will improve usability without testing, relying only on internal testing rather than user research, and using splash pages or tutorials to compensate for poor design rather than improving the core design. It also notes cognitive limits like Miller's 7±2 rule for chunking information and discusses how overconfidence, meaningless metrics, and lack of user understanding can lead to bad design choices rather than actual user needs.