Why so many downvotes lol

Absolutely essential is using a firewall and set it as strict as possible. Use MAC like SELinux or Apparmor. This is extremely overkill for a personal server, but you may also compile everything yourself and enable as many hardening flags as possible and compile your own kernel with as many mitigations and hardening flags enabled (also stripped out of features you don’t need)

Sidenote: If you just want a nice web frontend for others to view your Git repositories, you can use cgit instead.

In contrast to my experience, all the other search engines stink. Google is the only good one. But I suggest using a frontend like Araa if you want privacy.