how to rename existing branch name in git code example

Example 1: git rename branch

git branch -m <oldname> <newname> # Any Branch
git branch -m <newname> # Current Branch

# For windows if you get "Branch already exists" error
git branch -M <newname>

Example 2: how to change branch name

Rename a local and remote branch in git
Rename your local branch. If you are on the branch you want to rename: git branch -m new-name. ...
Delete the old-name remote branch and push the new-name local branch. git push origin :old-name new-name.
Reset the upstream branch for the new-name local branch. Switch to the branch and then: git push origin -u new-name.