He does trade shares for a living as well as write about them & conduct seminars.
So he does walk the walk as well as talk the talk.
You won't go too far wrong following the advice in his books. ( He's written several ) I even got to proof read parts of one of them for him. So that one at least has gotta be right... or at least the part I checked ! !
Specially like his 2% stop loss rule. But it's a bit like weight loss diets. A lot easier to read about than to do, but if works if you follow it.