There was a "Discover Dorico" livestream yesterday (MM sent an email about it).
https://www.youtube.com/live/hJnUcea3K8Q
John Barron does these in-depth videos once a month, and they can be worthwhile, just to see someone actually using the app in real-time. It's an hour and a half (though you can play it faster! and there's a table of contents.)
Dorico Livestream
Moderators: Peter Thomsen, miker
