What are the backward customs abroad?

Take money with your right hand only, and agree when you turn your head.

1. Foreigners always take money with their right hand when buying things, including when changing money. It is said that if they pay with their left hand, it is disrespectful to people, and customs are backward, which limits the role of their right hand.

In some foreign countries, when people agree with their opinions or recognize their actions, they always nod (to the right) instead of nodding. This is a relatively backward custom, and the expression of meaning is very unclear.