I’ll start by plugging Harvard’s free courses catalog as well as Udemy
Edit: Gonna add 2 more I remembered-
Blender - I wish I had more time to learn it, but I did start the infamous “Donut Tutorial” once!
Watch Cartoons Online - Lots of good older stuff!
Most people will stop reading right there. Plex is so trivial comparatively to set up. Don’t get me wrong, I love Jellyfin. It’s amazing that it exists and I want everyone to be on it. But Plex exists and has its market share largely because of how easy it is to up both on your local network and beyond it, not to mention adding friends and family.
I could write out a short half page set of instructions and a person would be up and running in like 30 minutes tops. Even people with very poor tech literacy.