Where To Start
The best place to start is with a bet placed on the "Win Line". The Shooter makes his first roll (called the "come Out Roll") and you win immediately if the numbers of both dice total 7 or 11. But you lose if craps (2, 3 or 12) are rolled. However any other number rolled becomes the "Point" which means you are now betting that number will come up again before a 7 is rolled. If it does, you win.
Alternatively, a "Don't Win Line" bet is just as easy. It is simply the opposite of the Win Line bet. You lose if 7 or 11 comes up on the Come Out Roll and Win on 3 or 12. (2 is called a "Stand-Off" and you neither win nor lose). Any other number becomes the Point is rolled. If it does, you win. Alternatively, a "Don't Win Line" bet is just as easy. It is simply the opposite of the Win on 3 or 12. (2 is called a "Stand-off" and you neither win nor loose.) Any other number becomes the Point, but in this case your betting the 7 will come up before the point is rolled.