I publish the books that did not convince me too, because a reading list with no filter says very little. This one is written for a mass audience, rests on the author's anecdotes, and in the chapter explaining where to invest it presents a supercar as an asset that appreciates. Once you have read that, the rest needs handling with tongs.
What survived
Sell shovels instead of digging. The most useful idea in the book, and it reordered my catalogue: when a lot of people are attempting the same thing, it pays to sell what all of them need rather than compete in the attempt. In my case it pushed the upgrade radar to the front — the tool that helps even the people doing the work themselves or with someone else.
The gap, not the income. What builds anything is not what comes in but the difference between what comes in and what goes out. My plan had a revenue target and no gap target; now it has both.
A smaller note, already decided on another book's advice and here given an extra argument: billing once a year weighs far less than billing twelve times when you work alone.
What I left out
Nearly everything else, starting with the investment advice. I am not a financial adviser, and this book should not be anyone's either.