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. 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.
That is what is difficult to control in trading, managing emotions often makes us have the wrong trading decisions, and even more impulsive which ends in large losses on the trade, It is very natural for traders to lose money at low levels of emotional control, I have also experienced it.
The thing that can help control emotions is to have a lot of understanding of how good and correct trading strategies, have targets and limits in trading so that our logic will warn our emotions to stay on the right path and not be easily influenced to make a decision that is not relevant to the analysis and strategies that has been made.