Different from Englsih, but similar to Bahasa Indonesia, German has a distinctive “you”. To someone we don’t know, or in a business nature, it is advised to have the formal “you”: “Sie”. But when we know each other or the person we talk to is about our age (or younger), the informal “you” (du) woud be okay.
Lately, more and more people use “du” instead of “Sie”, but it is always better to have the formal form until they welcome us. Once they call us with “du”, it means we are also allowed to call them in informal way.
Another point is, the formal “you” is always started with the capital. It is done so to differemtiate “you” with “she” and “they”.
In German, “she” and “they” are also “sie” (but not with the capital).
When the “sie” is in the middle of sentence, it would be easy to differentiate it, but what if it’s in the beginning of a sentence? Or what if it’s spoken?
It’s also easy! We’re going to learn about it later!