I didn’t do a push, so I can see right now that I have only a single branch on GitHub.
To create a branch test from Main, I make sure Main is selected and the enter my new branch name.
I’m going to create a branch as if I was doing a bug-fix. I create a branch from Test called bug-fix-readme and I make a trivial edit so I can track the change.
I commit the change.
If I change to the Test or main branch, this change will not appear. Check that in your own exercise to verify.