I think poker is very similar to trading, you have rake "fees" the odds are already against everyone, there's going to be winners and losers.
The ones with more knowledge are still going to lose no matter what, but it's a numbers game, you don't put everything you have on a single bet.
And over time, making marginally better decisions than others will be profitable.
And just like poker, with trading you need a winning strategy.
However, the difference is that when traders are old or professional traders, they will remain calm when they feel a loss, because they already have experience. This is different from new traders, where they might become very panicked if they experience a loss and they need time to recover their mentality to return to trading.
However, the most important thing is that both professionals and beginners must continue to learn to develop their knowledge and make the strategies they have even better.