Nonfiction relies on facts and data, making them integral components of the genre. Knowing how to incorporate data is fundamental for a writer. Sources and types of data of various kinds have crucial roles in enriching nonfiction works. This chapter elaborates on the intricacies of spreading data in nonfiction and suggests effective ways of handling and incorporating data for the book without disrupting the flow of reading. The chapter gives techniques for customising data for nonfiction, covering primary and secondary sources. The chapter explores the process of cleaning data to ensure its readiness for robust analysis. The importance of data in enhancing the credibility and depth of nonfiction is explained. It guides the systematic and thoughtful use of data to improve the overall impact of the narrative.