1. Prepositions of Time
2. Prepositions of Place
3. Prepositions of Direction
4. Compound prepositions
5. Proper usage of Prepositions
6. Prepositions + other parts of speech

Prepositions are mostly little words that are used before a Noun or Pronoun to show its relation to some other word in the sentence. In other words, prepositions link a noun or pronoun to another noun or pronoun in a sentence. Prepositions are used to show when something happens (prepositions of time), where something happens (prepositions of place) or where something is going (prepositions of direction).

EXAMPLES:
I shall meet you at 2 o'clock tomorrow. (indicates time: at 2 o'clock)
The kettle is on the table. (indicates a place or position: on the table)
We walked towards the cinema. (indicates direction: towards the cinema)

There are many prepositions, some of which are as follow:
about, after, along, among, before, behind, beside, between, by, for, from, in, into, like, near, of, off, over, to, since, through, under, with, within, without