Here is what Orwell has to say on the matter.
And here are some videos I made many years ago about it all.
EDIT: I made another one, god help me. This one is just to demonstrate some basic brush operations/how good Hammer is to somebody who makes tools at Epic Games. It was pretty fruitless in that discussion, but LDs may find it cathartic
EDIT: and here's another video I forgot about that's got some better ways to do things using the third party plugin MeshTool and the UE5 tool CubeGrid.
