"Utilisez chaque baisse comme une opportunité pour acheter des actions de haute qualité à prix réduit."

Simplified Meaning:

When things are going badly in the stock market, it's a good opportunity to buy shares of excellent companies at lower prices. Imagine you want to buy a fancy phone, but it’s usually very expensive. If you find that phone on sale for much less, you would buy it, right? The same idea applies to stocks. Sometimes, the stock market drops because people are worried about the economy. This means the price of shares in good companies can go down, even though the companies themselves are still strong and have a good future. Buying shares during these times means you can get them cheaper than usual. Just like buying that phone on sale, you’re getting a good deal by investing in solid companies when their prices are temporarily low. Over time, these stocks can go up again in value, and you could make a profit. So, the advice here is to see bad market times not as a disaster, but as a chance to invest smartly.