The website has a robust search function that may get to materials more quickly that navigating through the category tag structure. "Primary links" are located at the top of every page. If you click on "Search" you go to a page that allows a Basic Search--keywords search through all the site materials. You can also just search through Help, Books, and Users using the simple keyword approach.
There is also Advanced Search. If you click on Advanced search you may search by keywork or phrase; however, you may filter your search by "category" [all of the site's tag structure for Blogs, Wiki, Forums,etc.] or you can search by Content Type--i.e. just Blogs, or Books, or Events, etc.
Search results are summaries and navigation links to all the site materials that conform to your search parameters. A note--searching "Help" is of limited use at this point in the site's development due to limitations in the basic core Drupal module, thus the Help Forum.