What does the -M mean in git branch -M main?
GitHub says to enter git branch -M main as a step for creating a new repository on the command line. What does the -M mean?
-M is a flag (shortcut) for --move --force per the docs page on git branch. It renames the branch main (since the default branch name for repositories created using the command line is master, while those created in GitHub [starting in Oct. 2020] have a default name of main) and forces it (allows renaming of the branch even if the new branch name already exists).