Prepositions show various kinds of relations. The chief among them are given below.

Place

Important place prepositions are: in, at, on, across, among, behind, under, below, above, over etc.

Prepositions are not usually used directly before conjunctions, although it is possible in some cases.

Before that

Prepositions are not usually used directly before the conjunction that. In indirect speech, prepositions are usually dropped before that-clauses.

When a question word is the object of a preposition, the preposition usually comes at the end of the clause, especially in an informal style.

Infinitive clause as subject

An infinitive clause can be the subject of a sentence. This was common in older English.

Two word verbs

A number of English verbs can be followed by prepositions or adverb particles.

Some verbs are never used in progressive forms. Examples are: like, need,
believe, doubt, feel, imagine, know, love, hate, prefer, realize, recognize,
remember, see, suppose, think, understand, want, wish etc.
I like this kind of music. (NOT I am liking this kind of music.)
I need to talk to him. (NOT I am needing to talk to him.)

Dare is used in two ways – as an ordinary verb and as an auxiliary verb.

As an ordinary verb