Sometimes it's better to get bluffed, instead of calling your opponent's multiple value bets when you have almost nothing, especially when the pot is still small.
Pay attention to every action they do and what hands they show down. Certain actions will give more information like quickly calling or checking. See what hands they are showing at showdown.
I get two high pair AA or KK, I bet, the allin opponent, when opening the cards, he has nothing 2 and 8 different suits and ends up making a set or two pair, what to do?