The Check Raise on the flop (YOU HAVE TO BE OOP)
This is good for a lot of reasons
1. FOLD EQUITY. Giving your opponent a chance to fold when they are in position without donking is nice. Also, let's suppose they have a made hand and your chances to hit your draw are 38%. It is very reasonable for them to fold more than 12% of the time, winning you the pot over 50% of the time. It's reasonable for them to fold because of the next point.
2. Balancing Your Range. Let's suppose their made hand is dominated by your range the majority of the time, as in you would check raise your sets and maybe 2-pairs as well. Because of that, they are in the dark and taking a big risk by calling.
3. Implied Odds. Suppose they call, a turn card comes, and with your check-raising hand 1/4 the deck will complete your draw. You have a stacked pot there that is only going to get bigger if YOU WANT. You control the size of the pot, and with your big hands you can feel very safe betting with the nuts and winning HUGE when your opponent calls with a set or 2-pair.
Here's an example
You raise JcTc in the cutoff to 3BB. The button calls, and blinds fold.
Your outs: 9 to a flush, 8 to a straight, 2 counted twice. 15 outs, 54% chance to hit (likely) the nuts. This is ignoring hitting a J or a T would give you a made hand.
You check, your opponent bets 3.5BB, and you raise to 11B. There is a 20% chance he will fold, but he calls.
Your outs: 9 to a flush, 8 to a straight, 2 counted twice. 2 outs to a jack. 17 outs, 37%. This is ignoring that you may have a made hand. Your opponent bets 9BB. You call, because when you make your hand your opponent will likely still bet on the river, so on top of the nice pot odds you have the implied odds.
Woah, that's both your outs, a straight flush. That's another beauty of these things. Your opponent bets, you raise, he thinks and then either folds and you won a huge pot, or bets and you win more.