A memoir is a personal account of someone's life, usually written by the person themselves. Memoirs can be about any period of time in the writer's life, from childhood to the present day. They can be about a specific event or series of events, or they can be more general, covering the writer's entire life.
When writing a memoir, there are three key features to keep in mind:
A memoir should be personal. It should be written in first person and should be about your own experiences and feelings.
A memoir should be honest. You should write about your experiences and feelings honestly, even if they are painful or embarrassing.
A memoir should be interesting. Your experiences and feelings should be interesting to readers, even if they are not always positive.