Conjunctions are words that link sentences, phrases and clauses together.
Example: And, But, Because etc...
Prepositions shows relation in terms of time or place.
Example : In, At, By, On
The job of an adjective is to add further details, or descriptions of a noun.
Example : "A spooky house"
They can also be used as a superlative - "The second house was much more spookier!"
The role of an adverb is to add decription to a verb.
Example : "The quicker he ran, the faster the person who was following him got"
They can also be superlative - quickest