They say that you should "write about what you know", and that is what I do. I am a Licensed Private Investigator and animal lover. I have written seven children's books about animals, one about my experiences as a P.I., and my most recent is about weathervanes.
I plan on finishing my book about being an adopted child, and that will include the experience of meeting my biological mother. This will also lead to learning about having a biological father that was married eight times, and fathering 13 other children.