Qual è la differenza tra sini e sana e situ ?Sentiti libero di rispondere con un esempio.

Sini is actually when we pointing something near us.

Exp:
berdiri di sini. (stand here = stand near the speaker)

Sana is pointing something that far from us. in many case we can't see the objects.

Exp:
Rumah saya di sana. (My house is there : the house is far from the speaker. We cant see the building)

Situ is actually the same as Sana, it just more casual. But i think situ usually use when pointing something far from us but we can see it.

Exp: tasnya di situ. (The bag is there = we can see the bag)

한국에도 비슷한 단어가 있어요.
di sini : 여기
di sana : 저기
di situ : 거기

hope it useful🙏