每日钉一下（定期定额的定投方法有哪些缺点？如何改进？）

Group 1 - The article emphasizes that different stock markets do not move in unison, and understanding multiple markets can provide investors with more opportunities [2] - Global investment can significantly reduce volatility risk, allowing investors to share in the long-term growth of global markets [2] - A free course is offered to teach methods for investing in global stock markets through index funds, along with supplementary materials like course notes and mind maps for efficient learning [2][3] Group 2 - The article discusses the common method of regular fixed investment (dollar-cost averaging), which is simple and accessible for beginner investors [5] - It highlights the drawbacks of fixed investment, such as the need to increase investment amounts over time due to rising income levels, making initial fixed amounts less effective [6] - The article suggests improving fixed investment strategies by adjusting to a variable investment amount based on market conditions, which can lead to better returns by investing more when prices are low [7]