Three parts: an introduction to the trade, the steps for building a strategy, and setting up the business, with infrastructure, broker and software. The author says he started in futures and ended up trading currencies, and states up front that he recommends no broker and takes no referral commission, which in this genre already counts in his favour.
What survived
The two chapters on validating a backtest and on telling whether a strategy is robust. They describe the mechanics of self-deception precisely: test against the past, adjust the parameters until the result looks good, and mistake that result for a prediction. He tells it from his own beginner's experience, without dressing it up.
It is the same trap as a pilot designed by the person who needs it to succeed. Hence the criterion I apply: success criteria get written before anything is switched on, in a sentence that can be checked, and ideally by someone with no stake in the outcome.
And risk sizing understood as a prior decision: how much you can lose on each attempt is decided before the attempt, not once you are losing. Moved into a company, how much time and money a trial may cost without hurting is a conversation for the beginning.
What I left out
The other two thirds: choosing a broker, platforms, analysis software, setting up a currency trading operation. Neither my field nor transferable to anything I do. And the genre as a whole invites suspicion for a structural reason: anyone holding a strategy that genuinely works has no incentive to explain it in a book.