See my my user page at the English Wikipedia for more information.
Wikimedia Commons is a repository of free images, sound and other multimedia files. Uploaded files can be used as local files by other projects on the Wikimedia servers, including Wikibooks, Wikinews, Wikipedia, Wikisource and Wiktionary.
This page is an index of all Wikimedia Commons' help and maintenance pages. The following articles contain guidance and information about reading, authoring, and participating in the Commons community.
The function of MediaWiki itself (the software of Wikimedia Commons) is described at the MediaWiki User's Guide in Meta-wiki. The MediaWiki-handbook in Meta-wiki is not kept here in order to avoid duplicate maintenance work (the same applies to all help pages not specific to Wikimedia Commons).
If you suspect a software bug, ask for feedback at the village pump, and then report it using the BugZilla bug report system. This is the only way to get MediaWiki developers to notice your bug reports.
Other help page collections
As Wikimedia Commons is younger than Wikipedia and other Wikimedia projects and/or received less attention there are large sets of how-tos and other help pages available in those projects and are often also a good additional source finding a helpful How To for your work in Wikimedia Commons:
The database of Wikimedia Commons can be downloaded at http://download.wikimedia.org/commonswiki/. Sadly the available dumps are only the database text. There is currently no dump of the media files available.
Software helpful for Wikimedia Commons:
Legal information and contact
TUSC token: 751872e2d41ce7ce1ce881b488cc797b
I am now proud owner of a WMFLabs TUSC account!