Layers are challenging. I'm having to learn how to manipulate them in my 3D Achitect program, in order to produce construction plans for different views, e.g., foundation, framing, electrical, and plumbing, so we can submit them to the Town Building Department for a construction permit.
I had to do all that by hand for an addition to our house a while back. It was a homeschooling project :D
Then I was the one that dealt with the inspector to get it all signed off after we built it. And people think homeschoolers are 'sheltered' and need 'socialization'. HA! That was way more relevant to life than spending all day in a room with people your own age.