Hi,
I understand you would like to have some kind of higlights showcase for the product for everything what it can do. There might be some minishowcases ( as trailers with new releases or on the main page), but to show everything I think the video would have few hours.
Anyway, I'm just a causal user myself, but I knew some basics from PS already. Still what I can really recommend are DrippyCats tutorials, especially this one (I hope I can link this here):
https://www.udemy.com/affinityphoto-solid-foundations/
it helped me to understand a lot about how tools works and also some new informations from a photograpy point of view
