The dealer deals two face-down cards to every player. These cards are called pocket cards. After the first betting round, the dealer must burn a card and then deal the flop (three community cards dealt face-up on the table). Then a second round of betting is carried out. The dealer is required to burn another card and turn over one more community card. This deal is called the turn or fourth street. Then the third round of betting takes place. The dealer burns a card and lays the final community card on the table. This card is called the river or fifth street. Then the last round of betting happens. The final action is the showdown in which all players still in the hand must show their hands to determine the pot winner(s). Players must use either both of their pocket cards plus three community cards, one of their pocket cards plus four community cards, or none of their pocket cards and all five community cards to make their best hand.
If the dealer or a player accidentally exposes the first dealt hole card, the dealer must reshuffle, recut, and re-deal the cards. If the dealer exposes any following card, it may or may not be kept, but dealing should continue. At the end of the deal, the exposed card can be traded for the first card on the top of the deck, and the bad card is burned before the river. If more than one hole card is shown, a misdeal has occurred and a full re-deal must take place.
If the flop was inadvertently dealt before the betting round was completed or if there were too many cards dealt on the flop, all board cards must be remixed with the remaining deck, without the burn card. Dealer shuffles, cuts, and deals a new flop with no burn card.
If the dealer prematurely deals the turn card before betting is finished, that card is taken out for that round. After betting is complete, a card is burned, and the fourth card is re-dealt. The bad card is added back to the remaining deck (without burned cards), it is shuffled, cut and the final card is dealt without a burn card preceding it. If the river is dealt too soon, the same process is followed.
If a dealer deals one card too many, it may stand as the burn card. If more than one card is dealt extraneously, a re-deal is necessary.
And finally, a little poker etiquette, do not bet or fold out of turn. Pay attention and wait until you are in the position to act before you do so.