What is your costly lesson?
I trade! Yes I trade. This cost me to lose almost all the bitcoin I worked for. I first started with day trading, I will gain but later lose, I had to stop for a while, I learn margin and future trading where most of the losses were. The first I tried was 10x margin but later tried 125x margin for bitcoin. I started when bitcoin was $15000, I had $2400 worth of bitcoin during the time. Supposing I hold bitcoin, it would have worth $7200 by now, but I lost all to high margin future trading. Trading is not good, if someone will like to trade, the person should just use the amount he can afford to lose, because trading is very risky. I was also a gambling addict before, but that gone now, I can perfectly control myself and have fun and hold my crypto holdings tight now.