Here is another piece of common git commands I keep forgetting. I think the reason I keep running into these issues is that I keep switching between Git and Mercurial for certain projects.

Add your username and email to the global git ==version 1.9.2== config:

>>> git config --global user.name "Your username"

>>> git config --global email "Your email address"

Specify a default editor after you run git commit:

>>> git config --global core-editor your-editor-name>