Not total nonsense, that's why I said all three principles go hand-in-hand. System-wise, it's things like picking a system which has a proven success rate around +80% winners with pre-defined entry points, stop-losses, take-profit points etc. Money ...

How to better control our emotions?

In trading, 60% is psychology/controlling your emotions, 20% money management and 20% system. All go hand in hand. "Trading in the Zone" by Mark Douglas will help combat the 60%.

How to better control our emotions?