If you are greeting a person with whom you are familiar, you may or may not shake hands, though it is more likely in a formal situation. In most situations, meet strangers with an extended hand, and offer a firm shakes. Be aware of cultural rules that affect greetings between sexes. For example, it may be inappropriate for men and women to make a physical contact. Watch your posture, too: rise to your feet when receiving guests, and stand straight.