A $20,000 investment can go a long way with ASX exchange-traded funds (ETFs).
I would use it to build a portfolio that is simple enough to hold, but still has enough variety to feel well balanced.
The four ETFs below would give me global reach, Australian exposure, US market strength, and a small tilt toward one long-term growth theme.
Here is how I would split the money in July.

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Vanguard MSCI Index International Shares ETF (ASX: VGS)
I would put the largest part of the $20,000 into this Vanguard ETF.
The reason is simple: it gives me exposure to a wide range of large companies across developed markets outside Australia.
That can be valuable for Australians because our local market is relatively small. Many of the world's biggest healthcare, technology, industrial, consumer, and financial businesses are listed overseas.
This fund gives investors a way to own a slice of that global business machine without trying to pick each company individually.
I also like it as a core holding because it can quietly do its job in the background. Some years will be strong, others will be weaker, but a broad international ETF can help investors stay connected to global earnings growth over the long term.
Betashares Australian Quality ETF (ASX: AQLT)
I would still want some local exposure. But rather than simply buying the whole Australian market, I would consider this Betashares ETF because it focuses on quality companies.
The fund's index looks for businesses with high returns on equity, lower leverage, and steadier earnings.
I like that because the Australian market can be heavily influenced by banks and resources shares. I like the idea of taking a more selective approach and focusing on companies with stronger financial characteristics.
This ETF could still fall when the ASX is weak. But over the long term, I think quality filters can help investors avoid some of the weaker parts of the market.
iShares S&P 500 ETF AUD (ASX: IVV)
This iShares ETF would give the portfolio an extra tilt toward the US share market.
While the first ETF already has some US exposure, I would still be comfortable adding this fund because Wall Street remains home to many of the world's most dominant companies.
The S&P 500 is not just a technology story. It includes businesses across healthcare, payments, consumer products, manufacturing, financial services, software, and other areas.
What I like is the depth of the market. The US has a long record of producing companies that can scale globally, reinvest heavily, and become more valuable over time.
Betashares Global Cybersecurity ETF (ASX: HACK)
The final part of the $20,000 would go into a more focused ETF.
Cybersecurity is one of those areas that feels increasingly tied to how the modern economy works. Companies, governments, hospitals, banks, retailers, and households all rely on digital systems that need protection.
That creates demand for businesses involved in security software, threat detection, identity protection, cloud security, and related services.
This Betashares ETF is more targeted than the others, so I would keep the allocation smaller. Further, the share prices of cybersecurity companies can be volatile, especially if valuations become stretched.
Even so, I like the idea of having a small position in a theme that could remain important for many years.
Foolish takeaway
If I were investing $20,000 into ASX ETFs in July, I would focus most of the money on broad exposure and then add a couple of deliberate tilts.
The aim would be to own a portfolio that can grow with global markets, include some local quality, and capture a small slice of a powerful digital security trend.
I would not overcomplicate it.
A mix like this could give investors plenty of diversification while still making the portfolio feel purposeful. For me, that is exactly what a long-term ETF portfolio should do.