Whether you have written nonfiction or fiction, all books in essence are about a story.
In light of more than 400,000 titles published last year and the number increasing daily with the explosion of ebooks and self-publishing, your book has to be exceptional to get noticed and to ultimately be purchased.
Here are some basic elements that should be in every book:
Known as the lead or hook in newspapers, the first sentence or paragraph should effectively communicate something that will entice, interest or emotionally attach the reader to your book so he or she will want to read the rest of the book.
Every word, sentence, paragraph and section or chapter should relate in some way to the theme or story in a significant way. Background information on a character, a situation or concept should not be there just to fill pages. It should all relate in some way like the Ying and Yang - each complement each other, each are relevant to each other as parts that create the whole.
This may sound obvious, but your book should have a beginning, a middle and an end. In essence, all questions, concerns or conflicts should be resolved by the end of the book. The reader should not be left with any questions whether your book is nonfiction or fiction unless intentional.
Content is king. No matter what you write about, if the content and the writing engages, inspires, entertains or educates with an emotional attraction, the world will open up to you.