Patient and slow teaching is the key
When I look online at the many videos that are available, the biggest problem is that they are too fast.
Many cram too much information into a short video.
Even with one 40 years of computer knowledge I find it hard to keep up with the pace of the videos that are currently available. So, I don’t know how anyone who is unfamiliar with computers, phones and technical terminology has a chance of finding the features - even the basics.