What git gotchas have you been caught by?

Question

The worst one I\'ve been caught by was with git submodules. I had a submodule for a project on github. The project was unmaintained, and I wanted to submit patches, but co

Answer 1

Create a new branch:

git branch new-branch

Work, commit, work ... Realise all my work is on master, not on the new branch.

I should have done:

git checkout -b new-branch

Why can't I do something like:

git branch -c new-branch

(c for checkout) with an option to make that the default behaviour???