"What is negative space?"
Q1) Negative space is essentially the opposite of what you are used to draw. It allows you to focus on the shape of the object you are drawing opposed to say, texture.
Q2) In my drawing I just drew as normal then I erased any lines inside my "positive space" then i colored in the background and any holes where you could see the background. In my cut out, I found it really easy, I was shadowing last year at the same time they were doing this, so I found this really easy.
Q3) negative space helps the artist see the shape of what they are drawing
Q4) I personally don't think that Negative space enhances drawings. I prefer texture in a drawing opposed to shape, so it doesn't really apply.