When setting up a new notebook and adding a remote, it may be useful to be able to specify the branch name as part of nb remote set, or to be able to set a default in the configuration somewhere. I've set up my local Git server to default to main instead of master, and GitHub has changed its default for new repositories too. This can be worked around with by running nb git branch -m master main after setting the remote, but a notebook-level or global-level configuration option would probably help as more Git repos default to main.