Using Git with your own servers—without a hub like GitHub or GitLab—is easy. This is the straightforward, quick and dirty way with no new concepts to learn. There are more advanced ways (like -bare), but I find 4 times out of 5 I just need a quick way to sync repos between machines.

The one annoying thing here is your push will be rejected if your are pushing the branch that is currently checked out on the server. You can quickly check out a temporary branch, push main, and then check main back out on the server.