I think there could/should be a related video(s) re class modules,and interfaces, and a layman's guide to rubber duck( just a higher level overview to associate the features). But I haven't looked very hard to see what really exists.
I did watch the session with Steve and Mathieu (yesterday) but haven't spent any time with it since.
I will say that this is (currently) the best video showing the use and coding of class modules. There are others on youtube, but this one has a specific context and you get to see the thinking process in action (in my view).
If anyone reading this has class module instructive videos, please post same.