Communication AAC
The following link will take you to some recommended and free online webinar training:
https://www.liberator.co.uk/training-events/training?utm_source=GDPR+%27Soft+Opt+out%27+list&utm_campaign=64a57cb537-April_20164_12_2016_COPY_08&utm_medium=email&utm_term=0_b639b2ebfe-64a57cb537-202104353
The following document gives a overview of AAC that you might find useful: SIMPLE AAC BOOKLET