Writing Tips for writing Mental Illness/Neroatypicals

With the over saturated amount of works I have read, I have stumbled across a few that contain characters that aren't nerotypical. And a few of them are written well, but quite a bit are written poorly and inforce harmful stereotypes about that disorder.
This is to help people understand how to write characters with mental illness, from someone who studies in in their free time.
If I do get anything wrong or forget to include some things please let me know and I'll promptly fix it

Symptoms of each disorder will be listed, please do not self-diagnose from this book. If you experience these symptoms, please consult a psychiatrist as many of these conditions can be dangerous when untreated.