The game of Poker is played using a standard 52-card pack (with some games adding a few extra cards called jokers). The cards are ranked from highest to lowest: Ace, King, Queen, Jack, 10, 9, 7, 6, 4, 3, 2 & 1. The best poker hand wins the pot. Players must place an initial forced bet (the amount varies by game) before being dealt cards. Bets can be raised or matched (called) by other players during the betting interval. A player can also choose to fold (drop out of the hand) if they do not have a good poker hand.
In addition to the forced bets, money can be placed into the pot voluntarily by a player who believes that his or her action has positive expected value. This additional money is not part of the total winnings from a hand and is placed by players who use a combination of probability, psychology & game theory to improve their expected returns.
When the dealer has finished dealing everyone their two initial hole cards, he will deal three community cards face up on the table, known as the flop. Then a second betting round takes place. After the flop betting rounds have concluded, the dealer will reveal a fifth community card, known as the river. The final betting round will then take place allowing players to make their final decisions about what their Poker hands are.
When it is your turn to act, you have more information than the other players and can better predict whether or not they have a strong hand. You can take advantage of this by acting last to increase your bluffing opportunities.