What I might do is a series of short posts. Pulling out some of the profound wisdom from the book. However, I'd still recommend that you buy and read the thing, both to support Bill and to make your training safer and more effective. It is certainly something that I have tried to apply in my book Hillfit on fitness training for hiking.
Summary of the introduction
The book is about delivering the benefits of weight-training without the risk of ether acute or chronic injury. This risk can be minimised by applying the most appropriate joint movements, posture and leverage (moment arm) in other words, biomechanics. This approach is not specific to any equipment - it is a filter through which to shape exercise with bodyweight, free weights or machines.
Quote from Bill:
The one constant is your body and biomechanics.