Let's assume a beginner enters into trading without knowledge and indeed most of them are not equipped with sufficient knowledge. So when they get a big profit from their first trade, then it is a stroke of luck. Why? because they entered the market without sufficient knowledge and without experience too. I think that is felt by some beginners who eventually think trading is easy, but they don't realize that they were just lucky at that time. However, not all beginner traders can feel this, it only happens to a few people. I remember some time ago my friend entered the market for the first time and they immediately felt a loss. So it was indeed because of luck.
Some beginners get lucky more than one time while others don't get lucky as your friend did but that doesn't dispute the fact that there's something called beginner luck for first time traders. Beginners shouldn't depend or expect this luck because when they do, they'll not get the luck. Luck isn't something that it's planned for, it'll happen to you when it's your lucky day, when it isn't, it won't happen. Newbies being lucky is what makes them to think that trading is easy hence, I'll prefer a newbie don't get an easy victory when he starts trading.
He should find trading difficult so he can focus on studying the market to understand everything about trading. Some newbie are lucky that they make a considerable amount of gains that they don't trade again and will tell anybody that asked them how easy trading is hence misleading others.
Gambling your luck away is easy.
Trading your way to the profit - is hard, but it's much more rewarding and essential than just relying on rumors / etc.