I don’t think Behind Bars will help you much. It’s enough to know that Dorico follows most of the Behind Bars conventions and they are widely accepted.
There are many videos available for Finale refugees like this helpful selection.
Though, personally, I would just forget Finale altogether and treat Dorico as something completely new.
In particular (unless you have a special need to replicate a house-style) just live with Dorico defaults until you know your way around.