A股3700点，该怎么操作？切记，这是上涨中最容易犯的错

Core Viewpoint - The article emphasizes the importance of long-term investment in high-quality stocks and warns against the common mistake of selling winning stocks too early, which can lead to missed opportunities for greater returns [2][3][4]. Market Sentiment - Recent market sentiment has improved, with the Shanghai Composite Index reaching around 3700 points and daily trading volume increasing by over 50% compared to the low trading phase in early April [1]. Investment Strategy - Investors often choose to cash out once their funds or stocks return to cost price, but for high-quality stocks with a safety margin, holding them long-term is more beneficial than frequent trading [2][4]. - The concept of "pulling out flowers and watering weeds" is highlighted as a common error in long-term investing, where selling reliable stocks simply because they have risen in price is a significant mistake [3][4]. Historical Examples - Legendary fund manager Peter Lynch achieved a 20-fold investment return with an annualized return of 29.2% while managing the Fidelity Magellan Fund from 1977 to 1990. He recounts a story where Warren Buffett emphasized that his most profitable stocks were those that others sold prematurely [3][4]. - Lynch's personal experience with Home Depot, where he sold the stock after a 300% increase only to see it rise another 5000%, illustrates the importance of holding onto quality companies over time [3]. Investment Philosophy - Lynch argues that investing in stocks can yield significant returns with a low success rate, as long as investors understand the companies they are investing in [4][5]. - The article suggests that investors should build a portfolio of companies they understand well, rejecting lower-quality companies, and emphasizes the importance of patience in the stock market [5][6]. Fundamental Analysis - The article concludes that successful investing is rooted in understanding the fundamentals of stocks. Investors should maintain a belief in their investments and avoid the destructive mindset of selling during downturns [7].