Here's just a fun little collection of resources I used to get the knowledge I have. Please keep in mind that not everything all these resources say is necessarily correct, but they all believe that they are. Use your own discretion.
Autism By Autistics Podcast, by Melissa and Sophie
This is the podcast that first helped me learn all that I was looking to learn about autistics. When I first was diagnosed, this is the podcast that kept me sane. "There are other people just like me, and they have such great things happening in their lives." This podcast taught me a lot of things and also helped me keep hoping for a brighter life for myself. I still love this podcast, even though there haven't been any new episodes in quite a while.
The Out-of-Sync Child, book by Carol Stock Kranowitz
Not only did this book fill me in on a bit of what people thought about autistics, but it also made me think a little bit more about myself. It did strike me as a bit callous and it is a fairly science-y book, but it gave me some pretty solid lists of what could be autism manifesting in a person's life and opened my eyes to what about me was autism and what might not be. It was immensely helpful at the start of my autism research.
Eating Disorders, A Comprehensive Guide to Medical Care and Complications, book edited by Philip E. Mehler (MD, FAED, CEDS) and Arnold E. Andersen (MD, FAED, DLFAPA)
This book is a bit more on the dry side for those of you who aren't interested/used to the scientific side of things, but if you're looking for some research done on eating disorders that I haven't covered, I'd definitely recommend this book. (Although... I'd also recommend having a strong determination to get through it because it's nearly 600 pages on eating disorders)
DSM-5, by the American Psychiatric Association
For those of you who are adventurous and science-y and want to know exactly what the currently acceptable cut-and-dry definition of a certain mental disorder is, the DSM is highly recommended. You don't need to read the whole thing, just look for whatever topic you want to learn about and read those pages. Usually it's fairly short. Just warning, it is pretty technical.
Understanding Mental Disorders: Your Guide to the DSM-5, by the American Psychiatric Association
For those of you who are curious and a little less science-y, I'd highly recommend this book. It's basically the DSM-5 simplified. It doesn't have every disorder, but it has a good portion of them.