I am a black jack dealer. You know that comparing card game
I've seen it in Vegas, but never tried it. Can you tell me more?
Most time people play it with one or more decks of 52 cards. You will always find it in all Casinos in the world 
What is the goal of the game.
Just to beat the  dealer. 
How do I beat the dealer? Is there a magic number I need to have?
You have to know this strategy. Players are each dealt two cards, face up or down depending on the casino and the table at which you sit.
Ok, I see is there anything more I need to know?
You might also want to know that  the dealer is also dealt two cards which include one up (exposed) and one down (hidden).
Interesting, how is the game won