Here's something about leaks, and keeping ahold of those chips that I have learned from making the mistake. When you are in good position, I.E. button, or last to act, use it to control the size of the stack and the betting should you have a hand that you feel is good enough to win, but may be second best. Here is what I'm talking about.
Your on the button with KJ, you have one caller from early position who is a known tight player.
You make a raise of half the pot, and they call.
flop comes 9-J-8
Your now heads up with Mr. visegrip, and he limps into the pot with a 2x BB bet. Do you call or raise here?
Well, if you know he's tight, then there is a very good possibility your up against another J, a straight draw, or possibly a made straight. You know Mr. Visegrip likes to be aggressive when he thinks he has the nuts, so you put him on either the top pair or straight draw. So, if he has a J and is looking for a race, I would have to put him on AJ.
Here, I would be raising his limp with half pot sized bet to check his strength.
So, Mr. Visegrip goes along for the ride with a smooth call.
Turn is a Q, and Mr. Visegrip decides to check to you.
You have never seen him check/raise since being at the table, so you decide to check back. Why? your not worried about a check/raise, right? Well, quite honestly, the lesson is about not leaking chips. You have put Mr. VG on a J and assume a pretty good kicker. You have the K, should he have the A, then you're now just a bit better because of your draw to a straight, but if he has the Q, he may just be inducing you to put more into the pot.
Now, here's where you can get into a lot of trouble with tight/passive players that also are pretty good readers of their opponents; and yes, they do exist.
The River comes a 10.
Now you have what you consider to be the up and down nuts, right? Not so fast. Instead of limping in here, Mr. VG decides to push in a 3/4 pot sized bet. He's screaming AQ, you have just found yourself in the tight/passive trap, and in my opinion, at the most call. I might even consider folding here, depending on the size of the bet, the size of my stack, and of course my pot odds. I have a very strong hand, but you're up against a player who in any other situation would have probably folded on the flop with a lesser hand.
You are asking yourself, "self, why didn't he fold his AQ against my raise post flop?", Answer, "He's a good player, who can read well." Maybe he put you on AJ or even KJ, but with your reraise didn't feel you had two pair. He decided to race, and you took a chance at improving your pair with the turn or go straight or hit on the river. You didn't do anything wrong with the post flop bet, but you got valuable information from it. And you didn't have to pay a steep price either.
I hope this wasnt' too long winded. The mistake I made in a hand like this was that Mr. VG was a bit more aggressive than I had anticipated. I made a 3/4 post sized raise and got smooth called. The turn, I bet to his check, which he smooth called. The river he led out with the 3/4 sized bet, which, having what I thought was the best hand, I raised to. Got called, got donkey whupped, and learned a very valuable lesson about controlling pot sizes.
Now, had Mr. VG been a more aggressive player, I probably would have been bet out of the hand much earlier, and not have bled out chips as I had. But you have to be very careful with tight/passive players who like to set traps. And there are some out there who do it with great success.
Hope you like this little story.