Punish the Limpers

A player limps (just calls the big blind instead of raising). That almost always screams weakness: they rarely limp premium hands. It's on you at the button.

The answer is to isolate: raise to get heads-up with the fish, play the pot in position and with the initiative — and many times you take their limp + the blinds without a fight. Since they enter so weak, you isolate with a wide range. What isn't worth raising goes in the muck: don't limp behind.