The nuts

The nuts is the strongest hand anyone could make from the community cards as they stand right now, paired with the right two hole cards. Because it can't be beaten, holding it means the worst you can do is split the pot if someone else also makes it. What counts as the nuts changes from street to street, since every new card on the board can create a stronger possible hand.

It comes up most when you read the board to ask, "What's the best hand out there, and do I have it?" Watch out: the best version of one hand type isn't always the overall nuts. If three cards share a suit, the nut flush (the ace-high flush) beats other flushes, but a paired board can allow a full house, and the right cards can allow a straight flush — either of which beats any flush. So "the nut flush" or "the nut straight" means the best of that hand type, not necessarily the unbeatable hand.

As a beginner, the useful habit is to look at the board on every street and figure out the actual nuts before you act, even when you don't have it. That tells you how much room there is above your hand and how worried to be when a big bet comes in. When you do flop the nuts, you don't have to slow down with practice chips, though sometimes a check-raise or a value bet keeps weaker hands paying you off.