The document provides tips for revising a website while maintaining existing page ranks. It recommends re-using high-ranking pages (page rank 4/10 or higher) and their URLs for important new information to help search engines recognize the site change but remain familiar with the pages. Lower-ranking pages or pages with no traffic should typically not be re-used. The document also stresses finding and addressing any outdated pages within search results to avoid broken links for bookmarked pages.