This is beginner-level content, which makes a lot of sense as a free resource. We're working on a Code School "Git Real" course for the end of July that will go much further than this and be at an intermediate level, just like most of the courses we offer through a subscription or individual purchase.

I suggest you check out the first level of that course when it comes out. I doubt you'll think it's an unnecessary indulgence. In the meantime our Node course is good example: http://node.codeschool.com