do not click on markdown
in notepad. It's ok to click on markdown here in your brower because I'm just letting you know not to click on markdown 
Forgejo is really easy to operate if you already have a server.
Codeberg is a large public Forgejo instance.
There is also https://tangled.org/ which I've meant to look into for a while but never gotten around to. I think it's promising but it's still alpha software. Forgejo and Gitea before it have been around for almost 10 years altogether.