Essentially, he advocates discipline. And note this:
5. I don’t play with derivatives.
Options seem fun but they are like allowing a toddler to play with a loaded gun. You can have a few close calls but it eventually catches up with you.
Anybody thinking about playing with options should paper trade for a few months to get the feel for it. And, at first, play around with no more than a small percentage of your portfolio. It's really easy to lose everything and more. Don't ask me how I know.
Buying my first Model S in 2014, using profits from trading TSLA, remains the best investing decision I ever made. And it was strictly an exercise in discipline -- I had started trading TSLA with the intention of making enough to buy a Tesla with the profits, and sticking with that rather than getting greedy was a very difficult thing.