ben cloward has a tutorial series about landscape materials on youtube here: Fixing Landscape Tiling - Building Worlds In Unreal - Episode 5 (youtube.com)
Hi! I would check out Epics documentation on the topic of Landscape Materials. Perhaps they have some step by step tutorial in their documentation too. If you want to cut out the tech-art part to focus on content, you could search for a sample project that does similar things you're looking to do and reuse its resources.…