Bowing is just simple action which is to bend your body and lower your head. But actually there are many rules in bowing.
For example, there are 3 kinds of bowing angles, 15 degree is for passing through in front of somebody which means “excuse me”. 30 degree is for business scene which means greeting and 45 degree for expressing deep appreciation or apologizing.
We need to take on different bowing degree depending on situation.