Since October 2020, Github made change about naming master branch to main branch as default when you create a repository.
So how about the existing repository and you want to change to main branch as default.
Here is how to do it in three steps.
# Step 1
# create main branch locally, taking the history from master
git branch -m master main
# Step 2
git fetch origin
# Step 3
git branch -u origin/main main
Check the git status.
# git status
On branch main Your branch is up to date with 'origin/main'. nothing to commit, working tree clean Done, now you have synced to main branch.
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