Help understanding Autism diagnosis at 20 yrs old

can anyone recommend a short, easy to read, clearly laid out book or website or podcast that my 20 yr old son can read/listen to, to help him understand his new diagnosis (alongside his ADHD/Anxiety) and some tips on self-help?  All the books i have read seemed to be written for the carers/parents of younger children, or are too long, or too personal 

thanks

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