How do facts in a memoir differ from facts in other types of nonfiction?

Nonfiction books are based in fact and can take many forms. Some types of nonfiction books are personal accounts, such as journals, autobiographies and memoirs, while others are more instructional, such as how-to books, manuals and reference guides. [ Scientific, religious and philosophical books are typically classified as nonfiction. Medical books, travelogues and essays are also nonfiction