You play blackjack by dealing with the card and get close to 21. With 52 cards, each of them has a different number of points.
Cards with numbers – from 2 to 10 – gain their face value.
Jack (J), Queen (Q), and King (K) gain 10 points.
Ace (A) might be counted as 11 or 1 point, depending on the value needed for the best hand.
For example, the dealer gives you 2 cards which are 7 and Ace. The total points can be either 18 or 8 depending on the next hand. The third card you withdraw has the value of 9 then your bet will be 17 because your chance of winning with 17 is definitely higher than 26.