Preposition of time: It is used to show the time or period of an action, example: early, since, at
He will arrive today at 12am, they came here since September.
Preposition of place: It is used to show the position of an object in a sentence, example: infront, behind, beside, under, on, between, in, at.
She is sitting infront of my friend, our school is between a hospital and police station, my bag is under my desk
