Some common mistakes to avoid when writing a biography include the following: Lack of thorough research or reliance on a single source. Inaccurate or misleading information. Excessive personal bias or projection onto the subject. Neglecting to verify facts or failing to cite sources. Poor organization or a disjointed narrative flow. Neglecting to balance objectivity with empathy. Overloading the biography with irrelevant details or digressions. Failing to respect privacy or ethical considerations.