The prepositions in, on, at are commonly used to refer to time. However, they can be used to indicate places and positions of things.
At the end of the book
At the door
At the 572nd street
At the back
At the front
At the crossroads
At the bottom
At the entrance
At the bus stop
At school, kids must behave.
At the store, Nisha buys her groceries.
At the end of the tunnel, there is always light.
At Johnny’s, Lee, Karl, and I meet every weekend to play video games.
At the roof, I threw some things.
On a helicopter
On a balcony
On a ladder
On the cat’s face, there are whiskers.
While driving on the road, she found her purpose.
On a boat, Harry travels every week.
On any porch, a swing must be hung from the ceiling.
On a trip has gone my boss, so he would not see my report any time soon.
On an Island, the story of Robinson Crusoe was originated.
In a village
In my hometown
In a car
In a boat
In a plane
In a taxi
In a traffic jam
In my kitchen
In the past
In an answer to
In response to
In a sense
In the hotel, there are roaches everywhere.
In my room, a mess happened because I left the windows open.
I cannot work in a bad environment.
Viola received her ticket to participate in the ball.
Successful people do not live in the past.
She saw a romantic scene in the movie.
While in refers to the placement or position of an entity being something or someone inside of a bigger entity, the preposition on refers to the entity being laid upon the other entity mainly on the top of the other entity. Moving to the preposition at, it indicates the entity being at the top, bottom, or end of something; at a certain address; at a general location; and at a point. Furthermore, on the point, it is used to pinpoint a particular spot.
Always remember to pay attention to the meaning you wish to convey. Sometimes several prepositions can be placed in the same position, but each leads to a different conclusion and aims at a different meaning. For instance, I take in something means I accept it or even eat it, while I take on something means I start doing something or even challenge this something.