What is a preposition and how do you use it

It's a word to link nouns, pronouns or just other phrases.

Some examples of using a preposition are:

simple prepositions:

He sat on the chair

He drank milk

double prepositions:

The baby climbed on the table

She never leaves without her phone

Compound:

She sat beside Marie

My dog ran track with me

Participle preposition:

She is interested in anything concerning horses

Phrase preposition:

The baseball game was cancelled because of the rain

You can basically use them by showing location, time, direction, cause and possession.