Does it touch on mixing / mastering at all? I have a suspicion that some of my friends will be looking to me to put together some demos in the near future, so I'd be very interested in some beginner/intermediate knowledge around that.
I would recommend instead finding a well reputed mixing/mastering engineer who offers lessons and pay for some. Bring them your best mix (in the DAW on your laptop) ask them where it is wrong and how to improve it. Shouldn't take more than a couple of hours. In my case this cost around £100 (http://oood.net/mastering/about-stooodio-mastering) and helped enormously. My friends now think I'm great at "mastering" by which they mean mixing, I have nothing even approaching mastering engineer ears & I suspect Colin still wouldn't think much of my mixes either but that's why I'll happily pay him to master them if I ever have time for music again :)
I know there are online practical courses these days, in theory these could be better than a book as they would have audio/interactive examples. No idea if they actually are any good though.