Michael Kohl has a post on 10 Common Git Problems and How to Fix Them that new or casual Git users may find useful. There’s a lot of useful information in the post so it’s definitely worth reading.
Unfortunately, for technical reasons all his examples are links to gists. Each example is typically 2 or 3 lines so it would have been easy to just to copy and paste them directly into the post. But that’s just a nit. Unless you’re a seasoned Git user, you’re apt to learn something from the posts even if you have to follow links to see the examples.