Is there a core of good manners that polite people of all countries recognize?

Is there a core of good manners that polite people of all countries recognize?
Smiling and a slight bow are pretty international. Nodding yes and no. A look of appreciation for good food and service. Watch hand gestures. Some that are quite innocent here [ like our thumb out for hitchiking] are quite offensive in some countries.The State Dept. has pamphlets available for brief info on customs and manners.