The document discusses common mistakes in web design, including having too many graphics that load slowly, wordy pages with unnecessary text, poor color coordination such as dark text on a dark background, pages that require long scrolling, missing meta tags so pages cannot be found by search engines, poor navigation with broken or confusing links, using frames which prevent bookmarking pages, and orphan pages without links to help visitors understand how the page fits into the overall site structure. The document provides tips on optimizing graphics, reducing unnecessary words, using readable color combinations, limiting scrolling, including relevant meta tags and keywords, keeping navigation simple, avoiding frames, and linking orphan pages to the home page.