The object of Blackjack is very simple you most to achieve a total that is greater than that of the dealer, and which does not exceed 21. Even if other players are present at the table, the dealer is your only opponent in the game. 
You must consider your cards and your dealer’s card and remember, if you go over 21, you “bust”, and if you “bust” you lose.
How it’s play:
A card is dealt, face up, to each player in turn and then one to the dealer. The dealer’s card is face down and called the “hole” card, then you get a second card is then dealt, again face up, to each player.
Starting from the player to the left of the dealer, each player decides whether to draw further cards.
After all players have completed their hands, the dealer proceeds to draw cards to complete the dealer’s hand.
You win if your total is higher than the dealer’s total.
With blackjack you can win a lot of money.
Good Luck!