For example, is it right to say "People are different between different countries" (It sounds very right to me but my teacher in school taught us that "between two objects" while "among many objects". is it really important to use them differently in writing?
com/browse/between Among expresses a relationship when more than two persons or things are involved: Distrust spread among even his strongest supporters. Between is used when only two persons or things are involved: between you and me; to decide between tea and coffee. Between also continues to be used, as it has been throughout its entire history, to express a relationship of persons or things considered individually, no matter how many: Tossing up coins between three people always takes a little working out.
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https://www.dictionary.com/browse/between
Among expresses a relationship when more than two persons or things are involved: Distrust spread among even his strongest supporters. Between is used when only two persons or things are involved: between you and me; to decide betw