Hypothetical workflow.

gistfile1.txt

Make sure your local dev env is up to date:
`git fetch --all; git pull . origin/master`
Create an issue if one has not already been created:
Create a branch for the issue. 
`git checkout -b 123-abc-xyz`

Work on the code directly, add relevant files with:
git status
git add yourfilename.php
git commit -m "#123 fixing the issue by doing something"