For me I really do enjoy watching some of the Locking picking lawyers content and he is an expert when it comes to picking locks!
Another few are mental outlaw (although I think everyone knows of him here) and Steven Bridges who makes videos on card counting at casinos and he shows how much he wins/loses from playing
I’m recently really into Cracking The Cryptic, it’s two British guys solving daily variant sudoku and other hardcore puzzles.
Two Minutes Papers by some Hungarian AI scientist, where he discusses new papers in the field.
Michael Penn is a guy solving math olympiad problems while doing backflips.
Cracking The Cryptic is amazing. Their videos are so interesting to watch.
They also have great sudoku apps. They’re not free but there are no ads and they come with a lot of great puzzles.