RPG Architect has a few different sources for tutorials, each with different aims.
The official RPG Architect tutorials are comprehensive and designed to explain all features in longer-format depiction. They will be kept up-to-date with the latest changes and notes for what has changed (or may change) in the future.
Introduction to Entities
Introduction to User Interfaces
These videos are unofficial, but are recognized for covering some of the content that has not been covered in our official videos.