I play blackjack, and love getting dealt Aces, since they can count as one or eleven!
I see, my fiance deals blackjack, it seems like a difficult game
I guess if you counted cards to alter your play it would be difficult, but it's not hard for an average player.
Is it mainly about luck, do you play against the dealer or other players?
You play against the dealer, not the other people at the table.  I think it's a game of skill, though.
Oh so you try to get as close to 21 as possible, is that the goal of the game?
Exactly!  You can play with a single deck, but sometimes there are multiple decks in a shoe.
That would be hard to do it with multiple decks! How does it work if there is more than one deck
Shoe (cards)
A dealing shoe or dealer's shoe is a gaming device, mainly used in casinos, to hold multiple decks of playing cards. The shoe allows for more games to be played by reducing the time between shuffles and less chance of dealer cheating. In some games, such as blackjack (where card counting is a possibility), using multiple decks of cards can increase the house edge.
History.
Prior to 1961 in Las Vegas casinos, all blackjack was being dealt from a single deck
Super Fun 21
Super Fun 21 is a variation of blackjack. The game is played using a standard 52 card deck. Aces can be counted as either a one or eleven depending on which value would best benefit the player's hand. All the face cards in the deck each count as ten. The remaining cards are taken at face value. The player must first place a bet and is then dealt two cards face up. The dealer is dealt two cards as well, but one is face up and one face