No-Limit
In no-limit poker, when a player chooses to bet or raise, the size of the raise can be anywhere from the minimum bet to all-in (i.e. all of the chips the player has in front of them, or what many of us call the “jam”). The minimum bet will be equal to the size of the large blind. The minimum raise is the size of the last wager. A player who wishes to bet or raise but does not have enough chips to make the minimum wager may go all-in with their remaining chips.
Many flop games have an ante structure. Any ante does not impact the minimum or maximum bet.
Stud variations without blinds are rarely played in a no-limit format. The minimum bet would be the size of the bring-in in such a format.
As an example, suppose you are playing No-Limit Hold'em in a tournament at the 100/200 level. Unlike limit, this means that the small blind is 100 and the large blind is 200. The action folds to the player on the button, who says raise.
The minimum raise in this situation would be 200 more (making it 400 to go), and the maximum raise is all chips the button has. Suppose the button raises 300, making it 500 to go. The small blind then may fold, call 300, or raise anywhere from 300 (making it 800 to go) to all their chips. Suppose the small blind raises 700, making it 1200 to go. The big blind’s options would be to fold, call 1000 (i.e. 300+700), or raise a minimum of 700. Suppose the big blind folds. The button may now either fold, call 700, or raise a minimum of 700. In our case, the button calls, and a flop is dealt.
Unlike limit poker, the half bet size rule does not apply to no-limit poker. A player who has already acted and is not facing a fullsize wager may not subsequently raise an all-in bet that is less than the minimum bet or less than the full size of the last bet or raise.
There are an unlimited number of raises available to the players. Check and raise is allowed.