As someone who has spent the past eight years studying markets and trading, I can say that these are not bad heuristics. Nonetheless, I wouldn't recommend them to a new trader. As many traders are fond of saying, you must pay your tuition in money lost and sometimes emotionally brutal events like "blowing up." (Paying tuition is a popular phrase inspired by Edwin Lefèvre's Reminiscences of a Stock Operator.)

More than most professions, trading requires you to fundamentally alter the way you respond to stimuli. We have some natural biases that make us pretty unsuited to trading. Traders who are successful are the ones who remodelled their brain, a job that often starts with an intellectual sledge hammer. Studying a list of proverbs, no matter how good they might be, will not prove profitable. They might act as a good scaffold to lean on while "paying your tuition," but I am skeptical.

(This argument can be expanded to most proverb-style writings. In fact, I was going to write this in response to one of the 37,000 threads regarding ReWork during that mania.)