In Texas Holdem, there are three rounds of betting in total and each round is followed by a round of 'drawing', where the players can exchange unwanted cards for fresh ones. The first two rounds of betting are known as 'the pre-flop' and 'the flop' respectively. The third and final round of betting is called 'the turn' or 'the river'.
In each round of betting, players can raise, call or fold. Raising involves increasing the current bet size, calling involves matching the current bet size and folding involves forfeiting your cards and exiting the round of betting.
The betting rules of Texas Holdem can vary depending on the table stakes, the number of players, and the hand strength of the players. Generally, it is wise to play tighter in early position and play more aggressively when you're in late position. It is also important to remember that bluffing isn't always the best strategy. It can be a useful tactic to deceive the other players, but a successful bluff is relatively rare and should be done with caution.