Try stepping back, give this course a pause and take up the ones I linked you to. Modeling can be a mindbender at first, you have to get use to it little by little. It’s like going to the gym and trying to lift 800 pound weights right away, when your muscles only allow you 50 pounds. You have to build up to it, take vitamins, train a lot, it’s the same with Blender. So consider staying with just modeling for a while and take it from the basics with the Fundamentals and then with simpler coursers while you build up some 3D muscles.