The first betting round is called a pre-flop. If the first two players placed their blinds, the pre-
flop begins with the third player left to the dealer. The players then are allowed to:
1.    Call – the most passive possible step. If the previous player has already posted a bet, the next one should make a bet at least equal to the bet of the last player, in order to stay in the hand. So if the first player placed a bet of  $10, the second one raised it to $20, the third player should post $30 and the first player $20.
2.    Fold – discard.
3.    Check – to decline to make a bet but to keep the cards in order to have the opportunity to call or raise later.
4.    Raise – to increase the bet.
5.    Re-raise – to make a second raise.