Are you looking for sharp wit or to learn things? Has a huge influence on which subreddits to recommend.

Which subs would you recommend for sharp wit?

Sharp wit: r/redscarepod, and it's spinoff subreddits (e.g. /r/rs_x) are quite snarky and ironic. r/TimAndEric. r/DecodingTheGurus.

Intelligent content: r/slatestarcodex, r/EzraKlein, r/ReproducibilityCrisis, r/wikipedia, programming language subreddits, occasionally r/interestingasfuck.

learn things, personally