I think it is so obvious now that one of the huge causes of traders losing monies is a lack of proper risk management in their trading. Now, I have been teaching a doctor friend how to trade including, using risk management in her trading. She makes good monies as a doctor in her profession and has lost 7 figures in the stockmarket. That is not a typo! Of course, there are multiple reasons why she lost that amount but, a good chunk of her losses is due to lack to risk management. She also, trades options like me. When you are in a trade, you still have to manage that trade because your monies are at risk. Take her VRX/BHC (now) trade. She bought call options on VRX when it was clearly trending down. I told her to exit and close her call option trades. Now, she refused. I told her to buy some put options to recoup some of her losses and maybe, even make some monies. Again, she refused. Guess what she did next? She doubled, tripled down and bought more and more call options! Of course, the inevitable happened and she lost 6 figures in that trade alone! Now, I love her as a friend but, as a trader, she has given me so many white hairs on my head! Do not be like her! Cut your losses when you are wrong!
If not, the stockmarket will take your monies! All of it!