A Layman’s Guide to Recreational Mathematics Videos
reason-alone.com
reason-alone.com
A few things I would like to share to this:
Insights into Mathematics By Norman J Wildberger
https://www.youtube.com/@njwildberger/videos
I think he provides really good historical context.
Especially found his video with Howard Crowhurst on the Carnac alignments fascinating:
A Brief History of Mathematics By Marcus du Sautoy is also a great podcast:
https://www.bbc.co.uk/programmes/b00srz5b/episodes/downloads
Of course Gresham College has great wealth of lectures on many topics including mathematics:
https://www.youtube.com/@GreshamCollege
https://en.wikipedia.org/wiki/Gresham_College
Then there's great places like Project Euler that combines math problems and programming: