每日钉一下（长期投资，有这两大好处）

Group 1 - The article highlights that most investors are familiar with stock index funds but have limited knowledge about bond index funds and their investment strategies [2] - A free course is offered to educate investors on how to invest in bond index funds, including course notes and mind maps for efficient learning [2] Group 2 - Long-term investment is defined as an investment period of more than five years, which is often more challenging than most investors realize [5] - The article outlines two main benefits of long-term investment: it allows investors to ride out market cycles and achieve average returns over time [6] - For stock funds, investing for only one or two years may lead to unstable returns due to market fluctuations, while a longer investment horizon can provide more stable outcomes [6]