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.
Let SuggestBot point the way. SuggestBot is a program that attempts to help Wikipedia users find pages to edit. It matches people with pages they might like to contribute to based on their past contributions. It uses a variety of algorithms, including standard information retrieval and collaborative filtering techniques, to make suggestions. It also sometimes points people to the Community Portal, or their past edits, as a source of inspiration.
If you are looking for SuggestBot recommendations, you have these options.
AutoWikiBrowser is a specialized external semi-automatic editor designed for editing Wikipedia pages fast. Its main purpose is for doing search/replace operations on many pages. It can also append or prepend material, and you can do regular editing with it as well.
First you make a list, using AWB's listmaker, of the pages you wish to work on. Then you specify the search/replaces you want done. Then you click Start. AWB loads the first page on the list and shows you the changes it made, if any. If the changes are acceptable, you click Save, and AWB saves the page on Wikipedia. Then it automatically loads the next page on the list. AWB can even run scripts, and perform regex (regular expression) search and replacements.
In order to use AWB, you must either be a sysop or an editor with over 500 edits in the main namespace.
For on-the-fly general discussion and support requests for AWB, try the AWB IRC channel: #AutoWikiBrowserconnect