Usage patterns
〈場所〉の隣に〈物〉があるthere is ... next to ...
There is a bookstore next to the post office.
〈人〉の隣に座るto sit next to someone
I sat next to her on the bus.
隣の部屋the room next door
I can hear music from the room next door.
お隣さんone's next-door neighbor (polite)
I said hello to my next-door neighbor.