I don’t do any self-hosting anymore, but when I started I only had a couple uni classes that were related (I quit after about 9 months as uni wasn’t for me when I was 17). I somehow got recommended Gentoo linux back in the early 2000s and stood up my first server not long after (and got a lot of lessons in dealing with email servers). Now, I just don’t have the time to do it as a hobby and certainly not the money for any hardware in this economy. I thankfully never had any real security/hacking issues thanks in part to good guides even back then. It actually taught me a lot about both linux and many other things. I’m now a software engineer for a living, but mostly just doing backend work with little exposure to the infra side.