In this course you'll be focusing on your quadriceps, (the vastus in particular) however, other muscles will also be activating.
And so one of the side benefits of this course is that you'll learn how when you activate one set of muscles (without allowing your body to move) opposing muscles also activate. In the process, since muscles are working against each other, you create stability.
With quadriceps activation (the vastus in particular) in static poses you'll begin to get a taste of stabilizing your knees.
Once you can feel your quads (and activate them) while doing static poses, it's easier to activate them (and feel them activate) while moving. In these cases, depending on the type of movement, the movement itself can provides the resistance for your quads to work against.