Forgive the question, I have an idea of what I want to run on it (jellyfin, sonarr, etc) but I am having a hard time figuring out optimal OS to run.
Windows? Linux? Something else? Any beginner advice is welcome!
I specifically enjoy NixOS but I wouldn't recommend it to beginners as the documentation isn't great and the distro works differently from all other distros.
I would recommend linux mint.