https://darth-coin.github.io/

One of my favorite Bitcoin content creators of all times: Ioni Appleberg!
here is his Youtube channel. One of the best of the best!
https://www.youtube.com/user/waem/videos

Then we have 402 payment required:
https://www.youtube.com/channel/UC_62FowZPxGB6ysv4mcj20A

Then we have the old series "101 blackboard Bitcoin":
https://www.youtube.com/playlist?list=PLzctEq7iZD-7-DgJM604zsndMapn9ff6q

If you miss these 3... anything else is meaningless.