Preposition IN vs ON

IN

Use  in as a preposition to indicate:

The position or location in the year of occurrence
The towels are in the dryer.
We married in 2000.
The months and seasons points of the day
My flower garden is beautiful
He left  in the afternoon in the summer.   (exception: at night)
location within countries, cities, states, and provinces
She goes to school in Montreal.
We had fun in Mexico.
He lives in Ohio.
I met him in British Columbia.

ON

Use on as a preposition to indicate:
An object supported by a  the directional position top surface of something
The cup is on the table.
It’s the first door on the left .
a time of occurrence a method of transportation
I worked on the weekend.
I felt sick on the plane.   (exception: in the car)
the means of expression the subject of study
We talked on the phone for two hours.
I have a good book on horses.