The TracGuide is meant to serve as a starting point for all documentation regarding Trac usage and development. The guide is a free document, a collaborative effort, and a part of the ?Trac Project itself.
Currently available documentation:
If you are looking for a good place to ask a question about Trac, look no further than the ?MailingList. It provides a friendly environment to discuss openly among Trac users and developers.
See also the TracSupport page for more information resources.
Finally, developer documentation can be found in ?TracDev and its sub-pages.