I will leave pictures or explanations on some subjects the host covers if someone asks for them, but I'd recommand reading the author who's quite a bit better than me at explaning what happens.
I hope that this sort out the confusion. Of course, feel free to leave comments or, after reading, express how your understanding evolve. You may as well comment about how it influenced your game play.
In my case, I never got to hit as hard, as well and with as much spin as when I have put all this into practice. And, as good coaches will tell you, spin is control... if you own spin production, you own the whole court. And it did help me kick the hell out of pushers once and for all.