This video covers:
Building primitives: cubes, cones, spheres, cylinders, pyramids
Drawing Ellipses
Modifying primitives: shearing, rounding, bevelling, and more
Rotating forms and the movement of vanishing points
Rotation of Ellipses
Organic forms

I highly suggest starting with this video before moving on to any of the others on my channel.  While some of these exercises might feel laborious or somewhat boring, they'll prove to be invaluable techniques when we break down extremely complex subjects like human anatomy or machines into basic primitive forms.  I refer to all of the exercises covered here in all of the subsequent videos so please take some time to familiarize yourself with these techniques.