Definition of turning point
The turn is the fourth community card. After the preflop round, where each player receives his two hole cards, the dealer reveals the flop (3 community cards). After the betting period, if necessary, a fourth community card will be revealed, the turn. This card is called the "turn".
The turning point, a difficult card to play
The turn is probably the card that gives players the most trouble. The flop is often "fit or fold", meaning that if you don't hit the flop, you give up. If you have a hand, you bet, call or raise. On the river, we have all the information we need to make our decision, so we have help on that side. But on the turn, we are halfway between the flop and the river. If we were on a draw, we've invested on the flop and there's still the river to come. But there's only one card left to come, not two, and we may be facing a bet. If you want to improve your game, studying the turns you have played in the past is certainly a good idea.