Warren Buffett’s best investment advice is to buy the index fund – he recommends the S&P500 for solid diversification.

But there are multiple ways you can buy the S&P500 index fund.

1. Invest directly with Vanguard
2. Buy Vanguard’s S&P500 ETF (VOO)
3. Buy the Spiders ETF (SPY)

We examine the pros and cons of each one in terms of expense ratio, trading commissions, and more.

We also examine a strategy that uses a no-fee broker (Robinhood) – and how this approach can let you get invested into the index fund without trading commissions.

However, the one downside is that when it comes to dollar cost averaging, it’s not so simple as you can’t buy decimal numer of shares. Still, our preferred method of getting invested in the S&P500 is either to buy SPY or VOO from your broker of choice.