Up and down

“Are you up for that?” “Yeah, I’m down”

Anton Petrov

Posts science videos every day, generally covering news or more recent discoveries

Brilliant has a bunch of math courses, up into calculus and other high-level math. It also has some gamification with points and daily streaks for completing lessons

Minute Cryptic has a daily cryptic crossword clue which is pretty fun. And they post video explanations for each solution, which is helpful for learning how cryptic crosswords work

I recently discovered Ben Eater, his videos about how computer hardware works are really interesting