Blackjack is a very simple game. You want to make a hand with a higher total than the dealer but still less than or equal to 21 points (when player or dealer goes over 21, they “bust” and lose the hand).
Cards are valued as follows:
2, 3, 4, 5, 6, 7, 8, 9 – worth that number of points.
Ten, Jack, Queen, King – all worth ten points.
Are worth 1 OR 11, whichever is better for your hand at that time (aces can and do change from 11 to 1 to avoid busting.