I co-run at least 2 clubs that help with that.
What are the best clubs for learning how to improve at chess?

I'm a big believer in slow chess games (30 or 45) -- as that is the closest we can come to OTB games here.
A place to find such games, and players who want to play that length is the appropriately named "Slow Chess League" --https://www.chess.com/club/slow-chess-league
The Bookworm Club, kinda new, endeavors to share ideas about learning, also -- https://www.chess.com/club/the-bookworm-club
@blackfirestorm . . . can you tell us about the two clubs you were referring to?
All clubs offer the chance to play games and get better through practice, but which ones offer additional resources for learning the game better?