Hello, here are some tips:
Combos of cards (16 offsuit, 4 suited, 6 pairs)
Math (2:1, 3:1, 4:1)
Bet sizing (cash mostly starts at 1/2, but you can find spots where 1/3 is nice)
Range advantages (imagine if the game was 23 handed how tight your UTG range would be)
Preflop ranges, although cash is a bit easier in this sense as you only have to learn basically 50-100+
Some basic live
tells which you'll see a ton at 1/2
Understanding what part of your range you're at and what you must do accordingly (
bluffing bottom in certain spots, calling top in certain spots, going for thin value which is huge if you want to crush)
Exploits as in certain people honestly will NEVER do XYZ so using game theory on them is useless as they're extremely unbalanced (old man coffee being a good example IRL, if you get 5 bet shoved 100+ bbs with him, you better have KK+ because to OMC AK is a drawing hand)
bankroll management and tilt avoidance, pretty obvious, but in the long run this can actually make you a ton of money by saving you a ton of money