You are probably talking about video content? I don’t have any advice concercing those, and I’m also interested if someone has some good self-hosted alternative for this kind of content.
On contrary, if you’re an ebook/webpage hoarder I had a long run in finding the best solution to keep my learning ebooks tidy and well organized.
If you are serious about learning through written textbook and web, having everything in one spot and also a buildin pdf reader, I really advise you to have a look at Zotero. Even if you are not a researcher it’s a very useful tool !
Also would suggest you to give the Zotero 7 beta a try instead of 6. Better UX, native macOS m1, linux, better pdf reader, webp reader… Alot of improvement !!
One thing you should be aware of, it’s their cloud syncing, which allow you to continue your work on another computer, which cost a bit of money. Nothing to exagerated though ! BUT if you’re a self-hoster you can sync your personal data folder through a bind volume/samba share/nfs/syncthing… What ever your poison is :).
Sorry if this doesn’t help in your quest of video content organization, but chances are, you’re also hoarding alot of pdf/web page content !