The document lists 21 tips for improving search engine optimization (SEO). The tips include making websites easy to use and navigate, considering SEO in website design, building quality backlinks, using keyword research tools, using descriptive captions and relevant media, avoiding hidden text or links, focusing on search phrases not single keywords, using keywords appropriately, checking for canonicalization issues, building quality over quantity links, creating unique quality content, having a clear call to action, using keyword rich image captions, knowing the target market, writing good SEO content, avoiding duplicate content, and finding how users search for content.