Below are the available written tutorials for Reality Editor:

Asset Migration to Another Project
Reality Texture Input Implementation
Custom Blueprint Node Tutorials
Exporting a UE Actor to ZD API (a.k.a ZDActor)
Activating Fire During Runtime
Open/Close Door
Rotating a Door with Function Parameters
Changing ZDText with Dynamic String
Activating Destructible Mesh
Creating Dynamic Materials
Reality Starter Project
Real-time Data Driven Action Plugin
Redirection of the Reality Engine Content