Mistakes are to be made, and we won't stop making them. I've seen the cliché being spread in the forum, that you've learned from experience and your mistakes, so you won't repeat them again. I only partly agree with that statement, trading is unpredictable...
True. You will learn many things while trading, but the market stays nearly unpredictable. You cant transfer your mistakes, because everything changes. Market conditions, players, price base levels, competitors, regulation. Its mass psychology. We can witness right now. Did anything new come up for bitcoin? Or did just persons offer their opinion about the proof of work energy usage?
The bad trading can still lead to yourself getting more calm or resistant to the waves. Even if you cannot predict anything, maybe after a while you are better at holding through.