Betting limits apply to the amount a player may open or raise, and come in four common forms: no limit, pot limit (the two collectively called big bet poker), fixed limit, and spread limit.
All such games have a minimum bet as well as the stated maximums, and also commonly a betting unit, [...]

All poker games require some forced bets in order to create an initial stake for the players to contest. The requirements for forced bets, and the betting limits of the game (see below) are collectively called the game’s betting structure.
Ante
An ante is a forced bet in which each player places an equal [...]

Players in a poker game act in turn, in clockwise rotation (acting out of turn is a breach of etiquette and can negatively affect other players). When it is a player’s turn to act, the first verbal declaration or action he takes binds him to his choice of action; this is [...]