Learning from past mistakes is how humanity grows as well, that's the thing that allows us to grow as much as possible.
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This allowed past mistakes to be not repeated and start from a good place.
It is indeed that experiences will shape ourselves in the future . It makes us grow as a person. Whenever we are in different situations, we have different emotions that may be experienced. This is important to recognize and understand since it would help you analyze each situation and assess the emotions you experienced. This will help us to be better next time and do what should have been done at the first place.
This is the reason i always recommend every new traders to start trading with real money and don't follow any youtuber or telegram channel. As a newbie one can make many mistakes but these mistake will teach many skills and every mistake will increase your confident and next time you will be able to trade free of tention and as OP mentioned The more you trade your emotion will be controlled.
Depending on how well a person is doing financially, maybe trading in a demo account until gathering experience may be a better option. I saw many traders get wiped out early on in the pandemic and they stopped trading because they couldn't afford to lose the amounts of money that they lost, and felt "cheated."
People are wired to work ad gain income from their work, losing large amounts of money can break people down very early on and then they never gain the experience necessary to be profitable with their trading.
I think this is a good idea since i this way you could have your first trading experience with hypothetical money that isn't real. This would help you experience losses without compromising your hard earned money. But keep in mind that investing is risk and in no time you have to make your self be in that situation of risking through investments. I think people would only learn from their experience if they would fully assess and reflect on the actions that they do. If they just experience the emotions from losses without thinking further what really happened would make you gain no real experience from it.