Typically, you shake hands when you meet someone and you shake hands firmly. This is common everywhere. One additional thing is, if you are meeting a girl or woman and you know the girl or woman well, it is common to Hug the person. Just a light hug, where you just put arm around her back and just touch your head lightly. This not the hug like they show in movies ;) Just a friendly way to hug someone if you know the person well. It is etiquette to just greet a lady by shaking hand for the first couple of times until you know the person. But, sometimes if you meet someone in the club while dancing, then it is different, you may hug the person second time because you danced with them…it depends. In general, you only hug women or girls you know very well and it is etiquette to hug women in America