Record my US stock investments

At the age of 30, I just started investing in U.S. stocks, not individual stocks but broad market indices.

$VG S&P 500(VOO.US) 

$Invesco Nasdaq 100 ETF(QQQM.US) 

$Vanguard Total Intl Stock Index(VXUS.US) 

50% of the position is allocated to VOO, 20% to QQQM, and 30% to VXUS.

U.S. stocks account for 70%, and non-U.S. stocks account for 30%.

The advice for dollar-cost averaging in U.S. stocks is also based on the recommendations in the three books: "The Simple Path to Wealth," "Bogle on Index Funds," and "The Millionaire Next Door."

The advantage of dollar-cost averaging is that you don't need to worry about market fluctuations, but it's very dull and boring, and you can't enjoy high returns.

But this is also the first step I want to take as a beginner in U.S. stocks.

The book "The Intelligent Investor" says that before you have your own investment wisdom, you should follow what the market has validated.

I think this is also the first step I, as a conservative risk-taker, have taken.