You’re not going to become a billionaire by investing in index fund but it’s a lot safer than active investing. On average, you’ll do better in index funds but

You’re not going to become a billionaire by investing in index fund but it’s a lot safer than active investing. On average, you’ll do better in index funds but there’s a lot more variance in active investing. I’m up 400% over the past 4 years or so active investing (although at one point I had lost 50% of my initial stake). A coworker of mine lost 90% of his money this year. You’re not going to see either of those outcomes with index investing.