Nvidia fell 4%, and S&P 500 index funds took a hit too. Even if you’ve never bought Nvidia, you can’t avoid it. That’s the truth about indexes: you think you’re buying the broader market, but really you’re buying a bundle of a few giants. After doing this for so long, I’ve learned that position sizing is always more important than calling the direction. So what’s the takeaway? I haven’t figured it out yet either.