One very simplified model is that on the river, all your hands fall into certain buckets, from strongest to weakest. (I'm ignoring a ton of nuance here and ther

One very simplified model is that on the river, all your hands fall into certain buckets, from strongest to weakest. (I'm ignoring a ton of nuance here and there are actually many more buckets in a real game) - Worth betting, because you have the best hand - Worth calling, because your hand is good enough to beat a bluff (and maybe some value bets as well). - Intending to fold, because your hand is bad, but maybe it's good enough to win if the opponent's hand is worse and they don't bluff. - Worth bluffing, because your hand is so bad it can't win otherwise. The middling hands would literally be the middle two buckets in this example. Call with the better ones, fold with the worse ones. (To complicate this more, in a real world situation the worst part of the "intending to fold" bucket might become a "planning to bluff-raise" bucket, due to similar logic as to why you bluff with your worst hands.)