Poker is a game of cards where players bet on the value of their hand. Each player is dealt a set of cards which are placed face-down in front of them, then each player can place chips into the pot (representing money, for which poker is almost always played) according to the rules of the variant being played. The person who places the most chips into the pot wins the hand.
Unlike many card games, in poker a hand is not necessarily determined by the strength of its cards but by the number and type of bets placed. Bets are only placed when a player believes that the bet has positive expected value. These decisions are based on the combination of probability, psychology and game theory.
The divide between break-even beginner players and big-time winners is not as wide as many people think. Often, it is just a few simple adjustments that can be made over time that allow a player to start winning at a higher rate. These adjustments usually involve starting to view the game in a much more cold, detached, and mathematical way than one normally does.
A key aspect of poker is learning to read your opponents. This is done by observing your opponent’s tells. A tell is anything the player does or says that gives away information about their hand. These can be as simple as a gesture or as complex as a facial expression.