Prepositions – place
I left the keys in the car.
I worked in my garden.
I see two pictures on the wall.
My son played on the floor.
You can sit at the table.
She stood at the window.
He works at the airport.
We stopped at the traffic lights.
I like travelling by train.
We can go by bus.
The dog ran through the door.
I went across the street.
I flew over the forest.
When we speak about something inside something, we use in.
When we speak about something on something, we use on.
When we speak about something next to something, we use at.
When we speak about something inside some space which is around something, we also use at.
For example, at the airport, at the station, at home, at work, at school.
When we travel, we use by.
When we move and we are surrounded by something, we use through.
When we move and we move on something, we use across.
When we move and we are above something, we use over.
You can see more examples in the book The Little Prince.