The incident of buying when the price goes up and selling when the price goes down is true because we can be sure that they do it without having a good analysis like experienced traders. For those who are experienced, it is no longer a secret because maybe those who are experienced have also done it when they were just starting out in trading.
There is only one risk in trading, losing money.
Selling coins when the market is falling is one of the strategies for an experienced trader, who, unlike a beginner, then buys at a reduced price, while a beginner looks with horror at his reduced balance.