When doing the USB hub modeling we use the cut command to cut out from the top of the body. The demonstation had one create a rectangle, move it just into the body and move it off. When C is pressed it created the cut. I had to do trial and error before I got the cut to be the correct size. How does the size of cut relate to the size of the rectangle and where the rectangle is when you hit C. I'm confused as how one can get the cut just the right size?????

Great beginner course, thanks @Nikita Kapustin !