This tutorial aims to do a quick introduction to Unreal Engine 5’s new material system called Substrate. In this tutorial we are going to explore how traditional materials are converted to Substrate, how to define basic materials using established and new ways, and how to create multilayer materials in Substrate.
https://dev.epicgames.com/community/learning/tutorials/JPkb/unreal-engine-tutorial-your-first-15-minutes-with-substrate