Much of what you have learned with the other machines should apply.
If you wish, you can continue to use Vectric Vcarve (unless your copy’s licensing is tied to the other machines?)
If you wish to try Carbide Create we have videos:
https://carbide3d.com/hub/courses/create/
and I’ve written up a bit at:
For boxes the big question is what sort of joinery do you intend to do and how do you wish to approach it?
An SO3 has an overhang cutting area at the front, so one can do traditional joinery, but I’ve been working on various techniques to cut joinery into parts flat on the machine: