He said, "I am gradually learning how to conquer/manage GREED. Once I make small profit while trading, I will immediately close the trade. I am not interested in making $200 with $10."
I would like you to still update us on the progress of your friend, he must have been making consistent success before I can congratulate him. It's easier said than done. Besides, greed sometimes is not what people believe it to be and making a huge money can't be automatically greedy unless you make it outside your trading system and plan. And no matter how little your target is, if you don't have good money and risk management to back it up, you are still a loser, it's only a matter of time.