No limit Holdem, Pot-Limit Holdem and Fixed-Limit Holdem
No Limit Hold’em:In No-Limit Hold'em, players may bet or raise any amount over the minimum raise up to all of the chips the player has at the table on any street.
Pot-Limit Hold'em: The maximum bet or raise amount is to the current size of the pot, but otherwise the game is the same as No Limit Hold'em.
Fixed-Limit Hold’em: In Limit Hold 'em, bets and raises during the first two rounds of betting (pre-flop and flop) must be equal to the big blind; this fixed amount is called the small bet. In the next two rounds of betting (turn and river), bets and raises must be equal to twice the big blind; this fixed amount is called the big bet.