How to Rename a Local Branch

• If you're on the branch you want to rename:

    git branch -m new_name

• If you're on a different branch:

    git branch -m old_name new_name

What is the difference between '-m' and '-M'

• -m stands for "move" (or mv), which is how you rename files. It can throw an error if the branch with the same name exists.
• But if you want to force save your branch, use '-M' instead.