There is abundant knowledge online about disability in English. Here are some links to the most notable websites.
American Association on Intellectual and Developmental Disabilities - http://aaidd.org/
Autism - https://www.autismspeaks.org/
National Down Syndrome Society - https://www.ndss.org/about-down-syndrome/down-syndrome/
Understanding Intellectual Disability (University of Heartforshire) - http://www.intellectualdisability.info/
Intellectual Disability Special Olympics - https://www.specialolympics.org/about/intellectual-disabilities