Many people make money but cannot tell whether it is earned by ability or luck, especially some magic ones.
The simplest way to distinguish is, if a similar opportunity comes again, can you still catch it?
Some people catch the same magic by confusion, while others catch it under a certain trend and a certain sector. Although most of both are luck, the latter still has a high probability of success in the same market, and is vaguely correct.
Why do we need to distinguish between luck and strength? Profits and losses come from the same source. If you can't keep up with the cognition after making money, you will lose it back.
Those who make a lot of money in this market have experienced making money, bankruptcy, changing their minds and studying hard, and making money again, and they can make money continuously.
If you don't go through these, you can't keep it.