The document discusses 43 common web design mistakes that should be avoided. Some key points include:
1. Websites should clearly communicate their purpose within seconds to capture visitors' limited attention.
2. Content should be scannable through use of bullet points, headers and lists rather than large blocks of text.
3. Fonts must be readable on all devices and visitors should not need to zoom in to read content.
4. Forcing new windows, resizing browsers or requiring registration without reason will frustrate visitors.
5. Usability, readability and clarity should be prioritized over flashy or distracting design elements that interfere with the user experience.