Prepositions if place, are just like what the says for place. We normally use three main prepositions, In, On, and At.
Use on to refer to a position on a surface.
The notebook is on the desk.
The keys are on the counter.
Use on to talk about floors in a building.
The bathroom is on the second floor.
The parking lot is on the first floor.
Use on when talking about expressions like on the right and on the left.
The house is on the right.
The basement is on the left.
Use on when talking about public transport: on the bus, on a train, on a boat, on a plane, on a motorcycle, etc.
They are on the bus.
We are on the train.
Use on when reading, seeing, or learning something in the media.
She saw it on TV last night.
We learned it on the internet.
Use in to talk about a position inside a three-dimensional space.
The notepad is in the bag.
She is waiting in your office.
Use in to talk about areas that have limits, like continents, countries, cities, regions, etc.
We are in Scotland.
I love olive oil in Italy.
Use in for vans and cars.
She is in the car.
They are waiting in the van.
Use in when something is in the water: in the sea, in the river, in the swimming pool, etc.
The baby is having fun in the swimming pool.
They are in the river.
Use in to talk about things that are printed in books, pictures, documents, etc.
Who is that girl in the picture?
I saw a picture of you in the newspaper.