Here you can digest how to use Wikipedia in bite-sized morsels. The tips listed below were created for the Tip of the day project, or the Styletips project, but are listed here by title and organized by subject area for your convenience.
Topic lists link to articles on a particular subject. There are two types of topic lists on Wikipedia: outlines, and alphabetical article indexes. Outlines differ from categories found in Wikipedia's category system in that categories are usually limited to one level each in a tree, while an outline can be an entire tree, with many branches and many levels. This gives the benefit of having all the topics on a given subject in one place - this allows you to scroll down and read the whole tree, and every topic in that tree's subject. Indexes are single-level topic lists, with topics ordered alphabetically.
Topic lists allow for centralized management of all the links on a subject, as opposed to the decentralized approach of the category system.