Ever bought an S&P 500 index fund thinking you owned an equal piece of 500 companies? Not so fast. The biggest names like Apple, Microsoft, and Nvidia may be doing most of the heavy lifting in your portfolio, and that surprises a lot of investors. Discover how capitalization-weighted index funds really work, why diversification isn't always what it seems, and what every investor should know before blindly "buying the market." Simple, practical, and packed with eye-opening insights to help you invest smarter and avoid costly assumptions.