Trips
If the turn card made trips for you, with a pair on the board, then whether to bet or check-raise depends on how aggressive the flop bettor is.
For example, with the same hand and same flop as discussed earlier, suppose the turn card was a 7 rather than an Ace, making the board on the turn look like Q 
7 
4 
7 .
Now an aggressive player who had bet the flop will not likely be slowed down by the pair on the board, but if the flop bettor is a passive player, he might be concerned about the possibility that you’ve made trips and check behind you if you check.
Check and raise if you think someone else will bet.
If you’re not fairly sure that someone else will bet, then go ahead and bet it yourself.
Overcards
If you called “on the flop” (i.e. the betting round after the flop is displayed) with overcards ad didn’t hit one on the flop, you should usually fold if someone bets.
The best size is now double the size of the bet you called on the flop, and you’re not getting the pot odds to make another call in most situations.
Picking Up a Draw
There will be times when you called on the flop with, for example, an inside straight draw, and won’t be getting the correct odds to continue to call on the turn bet.
If you miss a draw like that, always check and make sure that you didn’t pick up a flush draw with the turn card.
If you now have a four-flush in addition to the inside straight draw, you almost surely have a good enough draw to call and take off the last card.
Letting Them Bluff
There are two exceptions when it’s often better to check and call than to bet.
That’s when the turn card is an Ace or is the third card to a flush on the board.
The reason is that those two cards present a bluffing opportunity to your opponent.
Checking gives them a chance to bluff.
The risk of checking is that they may check also, getting a free look at the river card.
The risk of betting is that they may fold a weak hand that they would have bluffed with had you checked; the benefit of checking is that it may induce a bluff; and the benefit of betting is they may make a mistake and fold even though they are getting sufficient pot odds to call.
If they do call, then you still benefit because you’re getting more money in the pot when you’re probably favored to win.
To decide which action is best, consider your opponents, weight the potential risks and benefits in light of how you expect your opponents to react, and take the action.
KNOWING YOUR PLAYERS
With the doubled bet, the turn is when many players try to get tricky.
If you get raised on the turn, it becomes important to distinguish between a player who is raising for information, and a player who is raising just cause he thinks it’s fun.
Each of those situations calls for a different response-basically, fold, raise, and call, respectively.
The effort invested in learning the habits and tendencies of your opponents will almost always pay off.
Entering a Public Cardroom / The Play of the Game / The First Betting Round
