github locks up mac terminal when using pull command

You’re in the text editor, vim! It’s a modal text editor, so you would need to:

1. Press i to enter insert mode.
2. Now you can type your message, as if you were in a normal
   (non-modal) text editor.
3. Press esc to go back to command mode.
4. Then type :w followed by enter to save.
5. Finally :q followed by enter to quit.