You must not be looking very hard. To name a few:
1. Manuals / Tutorials that come with the program, available with the downloaded software demo.
2. Book: Mastering Revit MEP 2011. 2012 coming in Aug.
3. Book: The Aubin Academy Master Series: Revit MEP 2011
5. Many blogs
Access a broad range of knowledge to help get the most out of your products and services.
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.
Upgrading to a 2015 product? Make sure to check these out 1st!