Kok opens with three experiments, moves on to photons and interference, reaches operators and the rules of the formalism, and closes with entanglement, decoherence and a chapter on what can be said about reality. It is an undergraduate textbook: there are exercises at the end of each chapter and you have to do them, because reading without doing them is watching equations go past.
What I took from it
The refusal first, because that is the professionally useful part: I stopped using any quantum analogy in a business conversation. Superposition, collapse, entanglement, the observer — all of them circulate as metaphors and none means what it appears to mean. People who have studied the formalism do not use them that way, and people who do use them that way almost never studied it. It is a cheap and fairly reliable signal when weighing up someone who is selling.
The discipline is the other part. Here intuition is no help and the formalism is: you calculate, and the result stands even when it offends common sense. Sitting down with pencil and paper in front of something beyond me restored a habit that erodes after years of solving things by experience. At work it looks like reading the code or the event log instead of offering an opinion about what probably happened.
And one idea from the decoherence chapter does transfer: erasing information costs energy. That is not a metaphor, it is thermodynamics. It casts a different light on conversations about keeping everything just in case.
What I left out
Everything else, which is the book. There is no application to ERP, to architecture or to AI; quantum computing appears twice and is a long way from any company I invoice. It is on the list because I genuinely read it and because not everything one reads has to pay off. If you want a business justification, this is not the book.