From my experience, traders make decisions based on emotions, ignorance, and poor strategies to manage risks resulting to losers. Some always let their emotions dictate the course of trading for them and rarely employ a stop loss order.
If the people still can't control their emotion and decide everything based on the emotion, it means they aren't ready to be real traders. They need to learn again how to be proper traders, they need to know how to manage emotion. It will be too risky if we trade with uncontrolled emotion, this just increases the chance of possible losses.
Daily learning and a rational approach are essential to achieve a goal. In addition, other benefits of investment diversification include managing risks or reducing on them.
It is not necessary to learn every day but it is needed to learn continuously. We don't learn trading like we learn our subjects in schools. However, we must learn it seriously as we learn all the school subjects.