I came to an understanding of what I think 'write what you know' means. To me, it means taking the emotions you’ve felt through your real life experiences and transposing those onto your fictional characters. Something good has happened to my main character – how do I describe it? How do I feel when something good happens to me?
I think that this is how you write characters that seem true to life; not because they are based on real-life characters, but because their reactions to your imagined situations are true to life.
Quote by Catherine McKenzie from post on Writer Unboxed