Hello there, feel free to check out this site: Sculpt Mode | Unreal Engine Documentation
It uses a visibility brush to punch a hole in the side of a landscape. Hopefully you can use this for your course.
However, first read this to setup a “hole material” to use Landscape Materials | Unreal Engine Documentation
The inside of your hole will likely be a static mesh underneath the landscape. I may be wrong, but sure does not hurt to try.