Greetings and kissing
Unless you are very familiar with each other and on first name terms you might shake hands when you meet. This includes children as well, so do not just say 'hello'.
At a party it is customary to shake hands with everybody. Stating your name as you greet someone is considered basic protocol. Understanding the name that they've just told you is another matter.
People kiss each other three times on the cheek when they are quite familiar and know each other well. This is the case for men to women, women to women, but not men to men.