What are QQQ stocks/ETFs exactly? Like, why 'QQQ'? What do the Q's represent or where do they come from? - Quora

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Besides market cap weighting, how does QQQ ETF decide to choose stocks? - Quora

QQQJ vs QQQM vs QQQN vs QQQE vs QQQ: What's The Difference?

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What are some alternatives to the QQQ ETF? - Quora

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