❯ git -v
git version 2.39.1
■ Delete local branch
git branch -d master
■ Rename local branch
git branch -m master main
■ Push the new branch, set local branch to track the new remote
git push -u origin main
git push --set-upstream origin main
■ Delete remote branch
git push origin :master
git push origin --delete master
I got this.
❯ git push origin :master
To https://github.com/your/project
! [remote rejected] master (refusing to delete the current branch: refs/heads/master)
error: failed to push some refs to 'https://github.com/your/project'
Switch default branch master to main at https://github.com/your/project
■ Show status
❯ git status
On branch main
Your branch is up to date with 'origin/main'.
nothing to commit, working tree clean
❯ git branch -a
* main
remotes/origin/main
❯ git branch -l
* main
❯ git branch -r
origin/main
■ Conclusion
Repository default branch
Choose the default branch for your new personal repositories. You might want to change the default name due to different workflows, or because your integrations still require “master” as the default branch name. You can always change the default branch name on individual repositories.
👉 GitHub - Settings - Repositories 
👉 Managing remote repositories - GitHub Docs 
