The Legend Meets The Future
The main choice here is between S&P 500 and Nasdaq 100.
TL;DR:
SPY tracks the S&P 500 with around 500 companies across all sectors, while QQQ tracks the Nasdaq-100 with about 100 companies that are heavily concentrated in tech. Think of SPY as the broad "entire US economy" play — you get everything from banks to healthcare to energy. QQQ is basically "big tech and innovation" — it's dominated by names like Nvidia, Apple, Microsoft, and Amazon, with over half the fund in technology stocks.
SPY is the diversified, sleep-at-night classic, while QQQ is a bet on the technological future. You know where I stand.
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