Index fund investing is the simplest, most proven approach to building long-term wealth for most people. Warren Buffett has repeatedly recommended it for individual investors. Academic research consistently shows it outperforms active management over the long run. Here’s everything you need to know to get started.
What is an index fund?
An index fund tracks a market index — like the S&P 500 (the 500 largest US companies) or the total US stock market. Instead of a manager picking stocks, the fund simply holds all the stocks in the index in proportion to their market cap. When the index goes up, the fund goes up. It’s completely passive — no human making decisions.
Why index funds beat most active funds
Roughly 80–90% of actively managed funds underperform their benchmark index over 15+ years. The reasons: higher fees eat returns, and even professional managers can’t consistently predict which stocks will outperform. The index captures the full market return. Active management charges more and delivers less, on average.
The best index funds for beginners
Fidelity ZERO Total Market Index Fund (FZROX): 0% expense ratio, no minimum. Vanguard Total Stock Market ETF (VTI): 0.03% expense ratio. Fidelity 500 Index Fund (FXAIX): 0.015% expense ratio. Any of these is an excellent core holding. The differences between them are minimal — picking one and investing consistently matters far more than which specific fund you choose.
Where to open your account
Open a Roth IRA or traditional IRA at Fidelity, Vanguard, or Schwab — all free with no account minimums. If your employer offers a 401k, invest there first (especially for any employer match). Then open a Roth IRA. Fund it with index funds. Automate monthly contributions. That’s the entire strategy.