Problem: git push -u main throws:
fatal: ‘main’ does not appear to be a git repository fatal: Could not
read from remote repository.
Diagnosis: Git expected a remote name but got a branch name.
Fix: git push -u origin main
Key insight: The syntax is always remote first,
branch second. origin = where to push (the remote
repository) main = which branch to push -u =
sets origin/main as the default tracking branch, so future pushes only
need git push