What is the difference between at and on preposition?Give examples alongside

'On' indicates on the surface of something. For example: The book is on the table.
It specifies days and dates. For example: My birthday is on 20th March.

'At' indicates to be near something. For example: There is someone at the door.
'At' points to a specific time. For example: I am meeting him at 2 o'clock.

 

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