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!
Is Jellyfin good with remote access?
You can do that with VPN. I’m using Tailscale, just had to make an account and install it on the computer I mentioned and on my phone.