Now that I've done the work on my local main branch to integrate the changes (via a merge commit), I can push that work on main back to the remote called "origin", like this:

$ git push origin main 

Now I'm all caught up, and the remote is caught up.

Key Learning Points:

Two commits are sent to the remote: My original local commit, and the merge commit.

My git push updated the remote's main branch to reflect my new work. Correspondingly, my local origin/main tracking branch is updated as well. In other words, the same process happened for me when I pushed, as happened for my teammate when they pushed.

✅ As before, my push updates the remote called "origin" (which happens to be Github), but it does NOT update anything in my teammate's repo; that would require explicit activity on their part.

✅ Now my teammate is behind! That is, their origin/main tracking branch no longer matches main on the remote called "origin". How would they catch up?