The aim here is to be able to look at player's stats and understand their ranges simply. Also just knowing the general 'rules' of preflop poker.
Something people forget way too often is that the SB and BB are BLIND bets. We have to attack these. It is simply dead money in the pot! Yes a player can have AA in the blinds but this happens such a small % of the time that it makes opening any button profitable, so we need to learn how to defend against these steals.
Using button vs big blind as a primary example, we can adjust our calling and 3betting ranges accordingly. We can actually defend call with a wide range of hands knowing that the button will have an even wider range. Peeling with all our big hands, suited connectors, suited gap connectors, pairs, all aces, most kinds Qxs, Jxs is fine. Once we have called we need to have post flop play confidence. This means floating, bluff raising, raising for value and folding. All of these are equally important and need to be used in a correct balanced way, not just done randomly.
Most regs will 3bet anywhere from 6-12%. Most will be around 8-10% and that is a good range to be at. This basically allows us to get value from our hands vs an average button-calling range. We are in control of the pot out of position with a hand that dominates/plays well vs our opponent.
Again, post flop, we need to have the confidence/conviction to bet both our high and low equity hands in a balanced manner. We know that a typical button open is around 40%. So if we keep folding hands that have equity over their hands, we are just giving them free money. Losing from the blinds is inevitable playing 6max and full ring poker. Its limiting those losses which is important.
A great blind players win rate will be around -12bb in the sb and -24bb in the big blinds. Still huge losses but if we are always losing -50bb from the sb and -100bb from the big blind, then we are winning a huge amount of our dead money back. We're doing this by understanding ranges and plays we can make both pre and post flop.