[Aga]

I have found the Pro Git book to be the best: http://git-scm.com/book

That, and constantly creating your own test repositories to test new commands/concepts. With a distributed VCS it's easy and fast. Just run "git init test" somewhere and start committing!

I also recommend you to use "gitk" when you're learning to constantly look at your history tree. That should clarify the concept "branches are pointers" after a few tests.