To sign git commits with GPG, read the instructions on GitHub.
To test if you get an error when signing keys, run this:
If you get this error:
Then run this:
If you don't want to do that every time, you can add it to your
.bash_profile by running
sudo nano ~/.bash_profile and typing
You can update a fork by adding an "upstream" branch along to your "origin" branch by following the GitHub tutorials.