There are many resources if you would to educate yourself about ADHD, PTSD, and ASD. These are some of my favorites.
Attention Deficit Hyperactivity Disorder (ADHD)
ADD & ADHD Symptom Tests, Signs, Treatment, Support
Autism Spectrum Disorder (ASD)
Simons Powering Autism Research
Post Traumatic Stress Disorder (PTSD)
National Center for PTSD
Cognitive Processing Therapy For Posttraumatic Stress Disorder