"Exposition: Explanation, usually in narration, of information essential to the story."*
In case you don't know, that's J. K. Rowling and the first book, first paragraph of Harry Potter and the Sorcerer's Stone. In those few words we learn a great deal about the Dursleys. They want to be perfectly normal, they don't like mysteries, and they don't believe in the strange. They also live on Privet Drive. Do you know what a privet is? Basically, a privet is a type of shrubbery most often used as hedges, also called "prim." Is it any surprise we don't like these dreadful people?
This is how to make the most of your exposition.
*LaPlante, The Making of a Story, W. W. Norton & Co., 2007. p.644