Hello João,
This is a question that I have been asked several times. In Portuguese, between and among will both translate as entre. However, in use in the English language we have a distinction. Between is used for a fixed and specific position in the middle of two things: people, objects, places etc. For example, the hotel is between cinema and the bank. The Cinema is on one side and the bank is on the other, the hotel then is in the middle between these two buildings. A common way to express this as a native speaker is to use two prepositions: 'in between'. For example, the hotel is in between the cinema and the bank
Among is used for an unfixed and unspecific position with many things: multiple people, multiple objects, multiple places etc around or surrounding the subject. For example, he walked among the crowd. In this case a person is walking among many people who surround him in all directions.
Between = entre duas pessoas ou objetos
Among = entre mais de duas pessoas ou objetos
Vejo que sua dúvida já foi respondida. Caso queira ou precise de aulas voltadas para conversação, entre no meu perfil.