This tutorial really covers just the bare minimum. I would have liked to see a mention of git diff for seeing changes. Since they didn't include it I'll list some examples here
git diff master..branchname # see changes between a branch and master
git diff origin..master # show changes that are in your local repository but not in the source
git diff # show modified files that are not part of a commit, ie. before running git add
git diff --cached # changes about to be comitted
There are many other things you can do with git diff but these scenarios are the most common for me.
If anyone wants to try out Github.com, this is the way to do it. The example works perfectly and definitely great to start out. I've played around with github a few times and this is definitely the best tutorial I've seen.
git diff master..branchname # see changes between a branch and master
git diff origin..master # show changes that are in your local repository but not in the source
git diff # show modified files that are not part of a commit, ie. before running git add
git diff --cached # changes about to be comitted
There are many other things you can do with git diff but these scenarios are the most common for me.