Materials are assets applied to meshes, contributing to a scene's visual aesthetic.
There are a few ways to create and edit materials for your UE4 project; however, we'll focus on using the Material Editor.
Navigating to your Content Browser, click Add New and select Material.
Name your material 'Rock'.
Your 'Rock' Material is now ready to be used.
Double-clicking the 'Rock' Material will open the Material Editor.
Read our Material - How-to documentation if you want to learn more about working with material nodes.
Size your textures using powers of two.