it is important to keep our mind calm during trading, because if our mind is calm, we can better research the trading strategies and take the right decisions and depend on confidence which helps us to adopt the right decisions and the right strategies. Because it reduces our stress while making any decision. When we sit down to do a task with a calm mind, we can fully focus on that task and we succeed in that task most of the time. And especially it is very necessary in trading, because in trading we lose all our money because of a little wrong research, so if we research calmly in trading we can take the right decision and as a result the risk of losing money is also reduced to a large extent.
It's true that keeping ourselves calm is very important, but I also believe that's not an easy thing to do neither. People know about how it is important to not trade with emotions, and yet they are failing at keeping their emotions at bay, they keep on trading like it's something that is getting too much crowd, and their mind gets too chaotic and they make mistakes.
Having a mind that doesn't stop worrying is a common thing in humans, we worry about things that doesn't even happen, anxiety is one of the most common illnesses in the world these days, so telling these people to trade while being calm isn't easy, they know what they should do, they are just incapable of doing it, and it's understandable as well.