Finding the right kind of information can be hard. I recommend these websites for the following areas of speech, language and communication:

ASLTIP:
https://asltip.com/members/ruth-kniveton/

Autism:
https://www.autism.org.uk/

https://www.autismspeaks.org/what-autism

https://autism.org/

PDA
https://www.pdasociety.org.uk/

Stammering:
https://stamma.org/

https://actionforstammeringchildren.org/

Developmental Language Disorder:
https://dldandme.org/

https://radld.org/

https://thedldproject.com/developmental-language-disorder-dld/

Selective Mutism:
http://www.selectivemutism.org.uk/about-selective-mutism/

https://childmind.org/guide/parents-guide-how-to-help-a-child-with-selective-mutism/


The Makaton Charity: 
https://makaton.org/

Down Syndrome: 
https://ndss.org/about

Kleefstra Syndrome
https://ndss.org/abouthttps://www.kleefstrasyndrome.org/what-is-kleefstra-syndrome/

RCSLT
https://www.rcslt.org/speech-and-language-therapy/