@fael097 There is a new path course at the Unreal Online Learning - Unreal Engine which teaches a lot of tricks and it is a set of several videos, with a companion project with lots of maps (one per video) which are really useful to understand what is missing giving the doubts you got. Just select in the Learning Path the route for ArchiViz and you will get there quite fast while learning a thing or two on things you might not even have experienced yet.