The developer community is publishing more content.
The Tridion developer site (different from the main corporate and marketing site sdl.com) also contains examples and primers from installation to templates: http://www.tridionworld.com/articles/sdltridion2011/index.aspx
The system is also programmable, therefore, in addition to the basic part of web content management, Tridion offers ways to program against an event system or configure a graphical interface.
To really get started, it will help to be or join a company that uses it. :-)
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