Your goal is to draw cards that total 21, or come closer to 21 than the dealer without going over. The dealer and each player start with two cards. The dealer's first card faces up, the second faces down. Face cards each count as 10, Aces count as 1 or 11, all others count at face value.

10 blackjack rules of thumb (with reasons for each)

Double Down on 10 or 11, Unless the Dealer Has a 10 or Ace. ...
The Dealer is Likely to Bust with six or Lower. ...
Betting Systems Rarely Work. ...
Always Stand with Hard 17 or More, Hit with Hard 11 or Lower. ...
Stand with Soft 19 or Higher, Hit Soft 17 or Lower. ...
Don't Take Insurance.