Success in trading begins with recognizing one's own mistakes. One of the biggest is trading without a clear plan. Often, beginners open positions based solely on emotions or 'advice from the internet,' forgetting about risk management. Without a strategy, trading turns into a gambling game. Another typical mistake is overconfidence after a few successful trades, leading to unwarranted risk. Even experienced traders can fall into this trap. Learn to be disciplined, keep a trade journal, and always analyze your actions. Mistakes are part of the journey, but the main thing is to learn from them. From my own experience, I advise you to train yourself to set a stop-loss, especially if you are trading some altcoin long, definitely set a stop-loss! Better to lose one dollar than one hundred! Something like that!