The Blinds
In Texas Holdem, a disc called "the button" indicates which player is the nominal dealer for the current game. Before the game begins, the player immediately clockwise the button posts the "small blind", typically half a small bet (for example, 1 in a 2/4 game).
The player immediately clockwise from the small blind posts the "big blind", which is always a full small bet (2 in a 2/4 game). Now each player receives his or her two hole cards.
Pre-Flop
After seeing his or her pocket cards, each player now has the option to play his or her hand by calling or raising the big blind. As mentioned before, the big blind is the size of a full small bet. Thus in a 2€/4€ Texas Hold'em game, it would cost 2€ to call in this initial round of betting (known as the "pre-flop").
In Texas Holdem the available actions are bet, call or raise. These options are available depending on the action taken by the previous player. Each poker player always has the option to fold. The first player to act has the option to bet, call or raise. Subsequent players have the option of calling or raising. To call is to bet the same amount as the previous player has bet. To raise is to match the previous bet and increase the bet.
Now, the "flop" is dealt face-up on the board. The flop consists of the first three community poker cards available to all active players. Betting begins with the active player immediately clockwise the button. All bets and raises occur in small bets (increments of 2€ in a 2€/4€ game). The same rules apply from above to complete this round of poker betting.
Note: The betting structure varies with different variations of the game. Explanations of the betting action in limit holdem, no-limit holdem, and pot-limit holdem can be found below.
The Flop
Now three cards are dealt face-up on the board - this is known as the flop. In Texas Hold'em, the three cards on the flop are community cards available to all players still in the hand. Betting begins with the active player immediately clockwise of the button. All bets and raises occur in small bets (increments of 2€ in a 2€/4€ game).
When betting action is completed for the flop round, the "turn" is dealt face-up on the board. The turn is the fourth community card in a Texas Hold'em poker game. Play begins with the active online player immediately clockwise the button. On this round, Same rules apply as above except that poker betting doubles from the small bet to the big bet. In a 2€/4€ game, betting on the turn is done in 4€ increments.
The Turn
When the betting action is completed for the flop round, the "turn" is dealt face-up on the board. The turn is the fourth community card in Texas Hold'em. Play begins with the active player immediately clockwise of the button. On this round, the betting doubles from the small bet to the big bet. Thus, in a 2€/4€ game, betting on the turn is upped to 4€ bets.
The River
When betting action is completed for the turn round, the "river" is dealt face-up on the board. The river is the fifth and final community card in a Texas Hold em game. Betting begins with the active player immediately clockwise the button and the same poker rules apply as they do in the fourth card explained above.