Calling is defined as putting money in the pot to match a bet that has been made before your turn to act. In Texas Hold'em two blinds are posted at the beginning of the hand by the two players to the left of the dealer button. These are live bets and in order to play your two starting hands you must call the blinds and any other raises that are made before the action gets to you. The number one reason that players lose money is they play too many hands. This means they call too much.