I believe the worst piece of advice ever given to any writer is ‘write what you know’. It makes me angry just hearing it. I will not be confined to the limits of what I know. How did Tolkien know about Middle Earth and Hobbits? How did Stephen King know the monster in your closet had claws and long dripping fangs?
Because if you want to be truly great, then you should write what you love, what you dream, or whatever the hell calls to you from the dark corners of your mind.
I don’t consider myself an expert except when it comes to common sense and this smacks of stupid. I know about being an accountant but I’m not going to write about it. Unless it’s an accountant who finds a doorway into an alternate world in the supply cabinet. Using familiar elements from your life to enrich a story is one thing but please for love of the written word…write what you DON’T know.