Culture
For men, handshakes tend to be firm and very often linger a bit. In order to show respect, people sometimes hold their wrists with their left hands when greeting. For women greeting women, a bow or handshake is appropriate. Sometimes with other women, you can show high respect by placing your left hand on the right elbow when handshaking and bowing.
Depending on what tribal or religious group you are around, people tend to speak very close to each other. Generally, an arm’s length is appropriate.
It is rude to make too much eye contact with elders. Women generally don’t look at men when talking with them.