How safe is the QQQ ETF compared to SPY? Right now, those two

SPY vs. QQQ: Investing in Different Indexes

SPY Vs QQQ: Which one is Better?

What makes the DIA different from other major average-tracking funds like the SPDR S & P 500 ETF Trust (SPY) and the Invesco QQQ Trust (QQQ)? - Quora

QQQ: Three Valid Reasons To Say Give Puts A Chance

How safe is the QQQ ETF compared to SPY? Right now, those two ETF's are highly correlated, but can that change (e.g., one goes up 10% one year but another goes down 10% in the same year)? - Quora

QQQ vs. QQQM vs. QQQJ: What To Expect From The Big 3 Nasdaq ETFs

Client Newsletter Example: Trading the Index ETFs On a Go-Forward

Why is the QQQ ETF outperforming the PNQI ETF? They are both meant to track big tech companies. - Quora

Why do ETF SPY and IUSA.L have quite different daily ups and downs despite both copying the S&P 500 index? - Quora

VOO Vs QQQ: Which ETF Is The Better Buy?

ETF ( or Index Fund ) That Mimics NASDAQ?

What is the best S&P500 tracking ETF - SPY, IVV, VOO? - Quora