Group 1 - The core trading rule for A-shares is the T + 1 system, meaning stocks cannot be sold on the same day they are purchased, and the earliest they can be sold is the next trading day [3] - The actual holding period for stocks depends on the investor's strategy and market conditions, with common extremes being either selling too early or holding too long without a clear exit strategy [4][10] Group 2 - Short-term trading typically involves holding stocks for a few days to a couple of weeks, focusing on capturing short-term price fluctuations and news events [6] - Medium-term investing usually spans several weeks to months, relying on industry trends and company fundamentals, with the challenge being to accurately identify trend reversals [7] - Long-term investing emphasizes the company's long-term value, with holding periods often exceeding six months or even years, and selling decisions based on fundamental deterioration or changes in industry logic [9]