Greetings
The Cambodian greeting is called som pas: put your hands together and slightly bow your head. It is impolite not to respond to a greeting.

Entering a Home
As in other Asian countries, it is appropriate to take off your shoes before entering a house. Hats and sunglasses should be removed as well. This is a way of showing respect to your host.
Smartphones are a particular target, so avoid using your phone on the side of the street, especially at night. Walking or riding alone late at night is not ideal, as there have been several incidents of solo women travelers being assaulted in isolated areas, usually after dark.

Dress Code
Dressing appropriately is important, especially when visiting a temple. When Buddhists go to a temple, they try to cover as much skin as possible. You should cover your upper arms and upper legs.
Temple Etiquette
Remove your shoes before entering a temple. A Buddha image is considered sacred, so do not touch it or stand on its altar. If you are sitting inside a Wat, tuck your feet beneath yourself.
It is forbidden for monks to touch or be touched by a woman. Monks cannot eat in the afternoon, so don’t offer them food or eat around them in the afternoon. When addressing a monk, you should use the word “Venerable” followed by his first name. When offering food to a monk, do not taste it beforehand.