Which approach should I follow?
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I would suggest you go with a balanced approach. Understand that VTI covers a lot of different markets, VOOG is all about growth stocks, and QQQ is all about tech stocks. QQQ will grow quickly, but it is more volatile.
So investing some amount in all three will lower your risk factor, and you can take advantage of tech gains.
Remember one thing for life while investing: for long-term progress, it's important to make regular investments and diversify your investments every month.