Fold on the Turn
In holdem poker, you will use five of seven cards to make the best possible poker hand. By the time 
you will have seen the turn card, you would know six of those seven cards, so you would have a good idea of how the hand will shape up.
This would also be the point at which the stakes would double. Consequently, the turn would not be the time to chase, because you would have only one card left, and it would become much more expensive to stay in the hand.
Hence, you would have to fold on the turn unless one of the following three conditions were met:
- You were holding the probable best poker hand. If this were the case, you must usually raise if another player were to bet, or bet if no one has bet yet.
- You were drawing to the best poker hand. As always, you would need to weight the pot odds to ascertain if your continued involvement in the pot would be justified. Usually, you would be getting the right price to draw to a flush or open-ended straight. Poker Theory. Also, if another poker player were to have clearly made a flush or straight, you could probably continue with a set (as you would have ten cards to improve). However, hands such as inside straight draws (four outs) or two pair when someone would have a flush (four outs) would have to be folded, unless the pot would offer appropriate odds to stay in the hand. In very large pots, you could call a bet with middle pair if you were confident that hitting either the pair or your kicker would be enough of an improvement to win the pot. You would have five outs in this case, and would at times get enough of an overlay from the pot to make a call the correct play.
- You were to be given a free card (that is, no one would have bet on this round). Evidently, you would be happy when everyone would check on the turn if you were to have a longshot draw such as an inside straight possibility or a pocket pair that would need to hit a set to win. Fundamentals of Poker. Sometimes this free card would allow you to win a large pot that you wouldn’t be entitled to. The lesson here is that when you would be on the flip side of things, you shouldn’t give your poker opponents ‘free’ chances to outdraw you.
Bet if you think you have the best hand.
You shouldn’t allow a poker player to catch a river card to beat you when he wouldn’t have called had 
you bet the turn. If you were hesitant whether you were holding the best poker hand, ??? on the side of aggression.
It would be much worse when a check would turn a hand that would have been folded into a winner than it would be to bet less than the best hand on the turn. The former would cost you a pot; the latter would cost you only a bet.
Your poker rivals were to regularly call the small flop bet with a wide assortment of hands, hoping for improvement on the turn. Then, they were to fold when faced with the double-sized turn bet. You would have to follow through on your flop bet by firing again, as the turn bet would pack significantly more punch.
It would be a cardinal sign of holdem poker to lose pots by granting free cards to unworthy opponents. In fact, this could be the single biggest reason why some poker players having good hand selections would fail to win at the game.
Occasionally on the turn the best play would be to try for a check-raise, rather than simply betting our. Ideally, the check-raise would enable you to win additional bets when you were holding the best poker hand. You should make sure, however, that the following two conditions would be relevant when considering this option:
- You would have to be fairly certain your one or more poker rivals would bet when checked to. It would be far better to bet and be called for one bet than to go for a check-raise, only to have the other poker players check behind you.
- If you were to check in a situation in which it could be checked around, your hand would have to be strong enough to withstand a free card. For instance, checking the nut flush or a full house would normally not cost you the pot if everyone were to see a free river card. However, if you were holding a nine and eight suited and the board were a pair of twos, a four, and an eight, anyone with overcards* would be a major threat to draw out on you. So, it would be best to bet this hand, because you couldn’t risk giving a free card to a hand like a king and jack or queen and ten. These poker hands probably wouldn’t call a bet, but they would be drawing very live – so you shouldn’t give them a free chance to draw out on your vulnerable hand.
Other than protecting your hand, it would be important to gain value by betting the turn when you would have the probable best poker hand. It would have to be your goal when playing holdem poker to win every dollar possible.
You wouldn’t do this by playing very guardedly on the turn. Many of your weak-playing rivals would call you down with any pair or even ace high, so you would have a lot of prospects to extort extra chips from them by betting when you were to feel you have the winner.