Elementary is a version of Linux.
https://en.wikipedia.org/wiki/Elementary_OS
https://en.wikipedia.org/wiki/Elementary_OS
On the one hand this looks great, maybe a way to rescue old computers. On the other hand they don't actually say that or tell you want Elementary is. I dug through the entire site, at length, and there's literally not a single word explaning what it is, so you have to conclude it's some sort of insidery tech bro-y god-knows-what but whatever it is they're apparently not interested in having people like me use it and so I'll have to find my solution elsewhere.