Your goal as a blackjack player is to end up with a hand total that is closer to 21 than the dealers hand - without going over 21. If you go over 21 you lose the hand. Learn more about the blackjack rules below.
Blackjack is a game where your hand only plays against the dealers hand - so whatever the other players at the table have is not really of importance (unless you are counting the cards that is).
After you have been dealt your first cards, you can choose to HIT and thereby get yet another card dealt to your hand, or to choose STAND and simply keep the cards that you already have - hoping the hand will be strong enough to beat the dealers hand.
After all the players have played their blackjack hands, the dealer players his hand out. The dealer always plays his hand according to fixed rules - no decision is left up to the dealer. The dealer must always follow the same dictated rules for how to play his hand. This would normally mean that the dealer must draw cards until his hand has a value of 17 - On most blackjack tables it says "Dealer Must Stand On All 17's" - as soon as he get to that total or above he cannot take any more cards.
A HARD hand is a hand with a ACE where you don't have the opportunity to use the ACE as a 1 OR 11. Example: If you have a ACE, 8 and 6 on your hand you can only count the ACE as a 1. Because otherwise you would have gone above 21 and thereby busted the hand. Counting the ACE as 1, the hands value adds up to 15. A hand consisting of ACE, 8 and 6 is called a HARD hand or sometimes a Stiff hand - because a hard hand is closer to busting then a soft hand is.
To read on, go to page 2 of 2: Rules of Blackjack.