https://www.linkedin.com/learning/unreal-engine-game-terrain-techniques

There are many reasons that you might want to take the time and effort to design terrains in your games. 

In this course, Joel Bradley illustrates the many benefits of using terrain in games and why having the concepts and background information on terrains can only aid you in your creation of useful landscapes for both the visual and playability aspects of your game. Joe shows how the tools available to you in Unreal can help to answer questions like: How are terrains created inside Unreal? How do we manage and craft terrains that work for our particular project? What principles do we need to think about when painting textures or populating our landscapes? And rather than employing a project-based lesson model, Joe imparts all this information in a way that can be applied to any project that you may be called to work on in the future.