you'll save a lot of money if you never bet your unimproved PP with 2 overcards if there are more than 2 players in the pot.

Assume an early standard raise, and you call with 55 and the others fold

Flop comes JJ2, or 843, or T74
If villain bets half the pot, you can generally raise it to 3 times his bet. Unless you see him check-folding hands after a PFR (i.e. he doesn't often make continuation bets). Alternatively you can flat call him. The problem with that is if your read is off, it's gonna be expensive. You flat call his KK and he fires again on a rag turn and you raise it thinking you have the best hand, and you're dead unless he lays it down thinking you have a set. I generally like raising lots to protect my hand if I think it's best because those low PPs are so hard to play. I can also see a free card and maybe induce a river bluff if I raise the flop.

If villain checks, you want reads. Is he capable of check raising a strong hand out of position on a raggy flop? Absent any read, I'm betting about 1/2 the pot and folding to aggression.

If you're OOP, and limp-called his raise and it's heads up and you got the same flop, there's three lines. You could check-fold. You could raise his cont bet 2.5-3x, especially if it's a weakish bet. Or you can just lead out for 2/3s of the pot. Especially if you're a player who doesn't mind leading out with a set.

I like a check raise line. It's very hard to call with overcards because the pot gets escalated so fast. It's also good to end the pot on the flop because you're out of position.