This tutorial describes how to modify the geometry of a surface with a texture using the Displace modifier in Blender 3.78c

1. Create a plane using SHIFT+A or the menu.

2. Press TAB to enter object mode and then subdivide the plane until there’s enough quads.

3. Create a new texture with your preferred settings.

4. Add a Displace modifier

5. Select the texture

6. Here is the result