Position. The Button acts last on every post-flop street and is the most profitable seat at the table. The Cutoff, one seat to its right, is next best. The Blinds act first post-flop and are structurally the least profitable seats, because you commit money before you have information. Widen your range as you approach the button; tighten it in the blinds.
Bet sizing. Size to the pot and to a purpose. A bet should either extract value from worse hands or deny equity to draws. If it does neither, check. Continuation bets of roughly half to two-thirds pot on dry boards, larger on wet boards, is a serviceable starting heuristic. Never size a bet to the amount you happen to feel like betting.
Bankroll rule of thumb. For cash games, keep at least 20 to 30 buy-ins for your stake. For MTTs, 100+ buy-ins, because top-heavy payout structures produce brutal downswings even for winning players. Move down a level after a defined loss threshold, not after your confidence breaks.
One habit that beats all of the above. Review ten hands after every session and mark each decision as correct, uncertain or wrong, before you look at the result. Results lie in small samples; decisions do not.
Evidence note: we did not locate a 2023 to 2026 peer-reviewed source quantifying the profit contribution of position or of specific bet-sizing schemes. The above reflects established practitioner consensus and mathematical reasoning about information asymmetry, and should be read as such.