To rename a local branch, enter the following into the terminal:

-m stands for move, just like mv is used in linux to rename files.

git branch -m <oldname> <newname>

If you have already checked out the branch you want to change:

git branch -m <newname>

Here is an example of renaming the feature/react-challenges branch to fix/react-hikes from FreeCodeCamp:

git checkout feature/react-challenges
git branch -m fix/react-hikes