Been trying to tighten up my hold'em game a bit lately, mostly low-stakes cash and the odd tourney, and funny enough the biggest jump for me wasn't any hero play stuff... it was the boring basics. Playing fewer hands out of position, not limping rubbish just because it looks playable, and actually checking stack sizes before I get too keen.
I reckon heaps of players, especially when starting out, spend way more time thinking about bluffs than the simple gear that keeps you out of trouble. Opening a bit tighter from early position, folding more of the dodgy offsuit hands, not getting sticky vs 3-bets, that sort of thing. Even post-flop, cutting out the autopilot c-bets helped me heaps when the board clearly favours the caller.
Also curious where people sit on one-pair hands at the micros. Feels like a lot of money gets torched by refusing to believe top pair is no good when the line from villain is screaming strength. Took me ages to stop paying that off, bloody hard habit to break.
What part of the game actually moved the needle for you once it clicked? Pre-flop discipline, bet sizing, reading board texture, folding more on later streets... whatever it was, chuck it in here. Keen to hear what made the biggest difference for other players.