Press Start is not a super beginner course, it’s more of an introduction so you see what’s possible, so answers may just leave you with more questions. I’d recommend you start with the fundamentals or basics courses, those will guide you through more of the knowledge necessary to understand modeling. Linking you up:
https://cgcookie.com/courses/blender-basics-an-introduction-to-blender-4-x
https://cgcookie.com/courses/fundamentals-of-3d-mesh-modeling-in-blender
https://cgcookie.com/courses/blender-mesh-modeling-bootcamp
