Trading is risky and loss is for everyone, every trader either big or small trader. If they can not manage their capital, trading positions well, they will have losses in the market. Big capital, big loss while small capital small loss.
To manage capital and risk, they can use Stop loss order, that is called as
one of best weapons in trading. If a trader does not use any weapon, tool to defend trading capital, it's a bad trader.
That is why it is not easy to manage emotions when involved in trading because someone who does not have experience will tend to follow their heart rather than strategy so that in certain conditions the trades they make can end badly losing all capital. Traders must have their own views on managing emotions, but without experience and knowledge managing emotions is much more difficult.
It is important to manage emotions in trading because that way someone can be more careful when involved in trading and stop loss can be used as a tool to control so as not to lose a lot of capital in the trades made.