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.
Wikipedia uses the Ogg Vorbis, FLAC and WAV formats for audio, as they are not encumbered by patents (an issue that prompted the decision that MP3 files will not be hosted at Wikipedia). Software supporting Vorbis exists for many platforms...
Various online tools (such as Zamzar) are available which let you freely convert one file format into another, and can be useful when you want to upload a file to Wikipedia.
Troubleshooting Wikipedia's look and feel with skins
Wikipedia should function and look right in any web browser. However, depending on the layout of an individual page and the Wikipedia skin set in your User preferences, a page layout might be broken in your browser. If the problem occurs on a single page, edit the page to fix it yourself. If you cannot fix it, put a message on the Talk page for the page (a screenshot always helps!). If the problem occurs on all pages, try a different skin. Your browser might have some minor issues. These are listed at Wikipedia:Browser notes.
For a listing of current collaborations, tasks, and news, see the Community portal. For a listing of ongoing discussions and current requests, see the Dashboard.