Advantages and disadvantages of index funds

Warren Buffett himself recommended index funds to both large and small investors in 2016. What makes them so attractive? What disadvantages do they have?
Investment funds.

Warren Buffett himself recommended index funds to both large and small investors in 2016. What makes them so attractive? What disadvantages do they have?

Costs negatively affect investment performance in the opposite way to compound interest: their cumulative effect can be very large.

Government debt, PIAS, or money market funds are safe options, although less profitable compared to real estate crowdfunding.

To choose wisely, consider whether both are indexed or not, our goals, and especially the costs and fees involved.