Writing can either be innate or a driving force for a writer to do it. Even the acclaimed writers need guidance from their fellow writers and professionals to polish their work.
Learning an overview of what fiction is, is not enough. You’re only seeing the tip of an iceberg but not the bottom. Writing a fiction novel is a never-ending process of learning, so it’s normal to commit mistakes, learn from it, and make use of that learning curve.
One would normally say fiction is better over non-fiction or the other way around. These two categories can either receive great remarks or criticisms regardless of its difference and style— it’s the author’s writing practice and intricacy.