An autobiography is about a person, what did they did in their life, and how they did same thing good.And is also written by that person too.And a biography is from somebody else.Last but not less autobiography has been written scenes history began has been recorded.
Memoir is a book written about yourself, and how you remember your life.
A memoir is not just plain everything, but like when you get your first car, when you got married, and other big events have happened in your life.
its not something that takes you ages to figure out, but very simple, just close your eyes and think of big, and important events that have happened to you during your lifetime.
Historical fiction is a fiction story based on the past. Sub genres include-
The American West/Western
The Ancient Rome
Early Humans and Animal Life
and ect.Historical fiction is a genre most often determined by setting and the inclusion of authentic historical events and characters in a fictional story.
Mystery is a fiction genre where a detective, either a professional, or just an ordinary little girl, and a police solve crimes, or a series of crimes.
Finding suspects, and figuring out why they are a suspect is usually a big part of mystery books.
Fantasy usually has unrealistic animals, settings and humans.
Fantasy also usually contains magic, and possibly in the medieval times.Fantasy can almost never happen in real life.