To buy index funds, you must first open a brokerage account. Popular, investor-friendly platforms known for low or zero fees include: Low-Cost Index Funds: A Beginner's Guide | Bankrate

The Beginner's Guide to Buying Low-Cost Index Funds Low-cost index funds are a foundational tool for building long-term wealth, often favored for their simplicity and historic performance. Legendary investor Warren Buffett famously advocates for this strategy, recommending that most individuals invest in a low-cost S&P 500 index fund for its broad market exposure and minimal fees. 1. Choose Your Investment Platform