I guess it was intended to be basic. The idea behind it is that you take 15 minutes and do some basic things and if you like it then you can then learn more about it... I think it's a great starting point. It gives noobs like me a good interactive, hands-on start.
I think this kind of stuff always has focus on basic usage.
Git has inumerous features and inumerous ways to do some of then. It's so much to put in this format.
If you like it and need some more go and read http://git-scm.com/book ... I've learned a lot in this online book.
I'd love that too… I wonder what the demand is for something like that.
I did some programming training a while back and found that there seemed to be way more people interested in the basics. I'd be curious if something like Git would be different.