Play Casino Craps

ive seen this happening continuously in the dice game craps. im just curious. also, why do people snap their fingers right after they roll the dice, before the dice even stop rolling? what good does that do? is it good luck?
and also how many people do you need to play the game craps? if you are playing with 1 person only, do you say “i bet you a dollar ill win” and then you hit a 7 or 11 and win that 1 dollar. is that how its played? and if you play with like 3 or 4 people and you bet, who are you betting againts and who is going to pay you if you win? and im not talking about casino craps, just regular basic also known as “street” craps.

Casinos will occasionally disallow craps shooters who have developed a proficient throw from shooting under the guise that they are not following the “rules” of throwing properly (although all skilled shooters follow all rules for throwing set forth by the casinos).
You will not, however, actually be banned or asked not to play unless you are being generally belligerent, are falling down drunk, or are attempting to cheat in some way.