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.
When you edit a page, you can use the Preview button (located right next to the Save page button) to see in advance what your edits will look like. This lets you check your work periodically without filling up the page history by making lots of smaller edits. The preview function can also help you avoid mistakes, such as when using an unfamiliar type of wiki markup. The preview will appear together with the edit box you have been working in (either above or below it, however you prefer).
An even faster way to preview a page is with the keyboard shortcut ⇧ Shift+alt+P.
There are three basic steps to building a topic list for Wikipedia: the first is to search Wikipedia to make sure it doesn't already have a list on the subject. The second step is to hunt down every word you can find on the subject, from your own memory, books, web directories, dictionaries, etc. Surround each term with double square brackets, and save the page.
Because Wikipedia has become so extensive, don't be surprised if most or even all of the links turn out blue (those are live links, each leading to an article on Wikipedia). Dead-end links are red, but don't remove them, because they show what articles Wikipedia is missing — anyone can click on a red link to create an article on that topic. The third step is checking each live article in the list for links to related topics. When you find one, add it to the list.