in this bear market, the most certain thing is that you know which cryptos have the highest return, don't bet what you can't afford to lose, here if you don't know what to buy, you will lose your money

$BTC
Hello, I am new to this and I don't know much. I had a question that I heard a boy from my work talking about.
He said that you can only lose the coins when a person sells them.

For now, I haven't done much other than buy 10 reais in BTC.