If you're exploring ways to track indexes, gain commodity exposure, or diversify beyond traditional stocks and bonds, you've probably heard of ETFs (exchange-traded funds). But there's a lesser-known cousin: Exchange-Traded Notes (ETNs).

If you're new to investing, ETFs (exchange-traded funds) are often the smartest first step. They give you instant diversification, rock-bottom fees, and the flexibility of trading stocks — all without needing to pick individual companies. Introduced in 1993 with the SPDR S&P 500 ETF (SPY), ETFs have exploded: over $8 trillion in U.S. assets by early 2024 and still growing fast in 2026. Here's everything beginners need to know — what they are, why they're great, the main types