What type of information is always expected in nonfiction writing?

Nonfiction or non-fiction is content (often, in the form of a story) whose creator, in good faith, assumes responsibility for the truth or accuracy of the events, people, and/or information presented.[1] In contrast, a story whose creator explicitly leaves open if and how the work refers to reality is usually classified as fiction.[1][2] Nonfiction, which may be presented either objectively or subjectively, is traditionally one of the two main divisions of narratives (and, specifically, prose writing), [3] the other traditional division being fiction, which contrasts with nonfiction by dealing in information, events, and characters expected to be partly or largely imaginary.