Each player is given two cards at the beginning of the Texas Holdem game. The cards are given faced down, and the value of those cards must be kept secret. In the online environment, it is simple to keep the cards secret, but in the land-based casinos, you will have to see those cards, and it is a strategy to do so without your opponents seeing the cards. The purpose of the Texas Holdem game is to combine those cards with the ones offered by the dealer, with the purpose of creating the best combination that will allow the player to get the pot.
If you want to understand the way the hands are evaluated, you will have to check the Hands Board Classification. As there are many combinations, each one with its own value, it is important to understand those cards and combination. This is why, for a beginner, spending a few weeks on the online playing platforms is an important step for understanding the game. The two cards given to the player can be combined with any of the cards on the table, and for each round, based on the estimations of the players about their chances to win, each one will place a bet according to those estimations.