...Of course I earned a lot and since it's my first time I became very confident thinking I'm so smart lol

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Every second person can tell such a story here on the forum. And this is explained by the fact that it was very easy to make money in the bull market, even for beginners. But then the bear market came and most of them lost what they had earned earlier. But now you have really more experience, which will allow you to save your deposit.