Investing doesn't need to be complicated. While some traders spend their days chasing short-term opportunities, many successful investors quietly build wealth by sticking to diversified, long-term holdings.

Exchange-traded funds (ETFs) make this approach even easier by providing instant exposure to hundreds — sometimes thousands — of companies in a single trade.

If you want to keep your investing simple but effective in 2025 and beyond, the three ASX ETFs listed below could form the backbone of a stress-free, growth-focused portfolio. They are as follows:

iShares S&P 500 ETF (ASX: IVV)

For most Australians, global diversification starts with the United States. The iShares S&P 500 ETF tracks the S&P 500 index, giving investors easy access to 500 of America's largest companies. This includes tech titans like Microsoft (NASDAQ: MSFT) and Nvidia (NASDAQ: NVDA), as well as household names like Coca-Cola (NYSE: KO), Starbucks (NASDAQ: SBUX), and McDonalds (NYSE: MCD).

The US market has historically delivered strong returns, and the iShares S&P 500 ETF offers a low-cost way to tap into that growth while benefiting from the stability of blue-chip names across technology, healthcare, consumer staples, and financials.

Betashares Global Quality Leaders ETF (ASX: QLTY)

Another ASX ETF that makes investing simple is the Betashares Global Quality Leaders ETF. It focuses on global stocks with strong balance sheets, high profitability, and consistent earnings growth. These are the kind of businesses that often outperform over the long term. It currently includes stocks like Visa (NYSE: V), a payments leader with recurring revenues, and Johnson & Johnson (NYSE: JNJ), a global consumer staple brand with enduring demand.

This fund isn't just about growth — it is also about resilience. By filtering for quality metrics, the Betashares Global Quality Leaders ETF helps investors avoid weaker companies that might struggle in tougher markets. This ASX ETF was recently named as one to consider buying by the team at Betashares.

Betashares Nasdaq 100 ETF (ASX: NDQ)

If you're seeking growth, then the Betashares Nasdaq 100 ETF is hard to ignore. It offers exposure to 100 of the largest non-financial companies on the Nasdaq. This captures the heart of the global technology sector.

Alongside Apple (NASDAQ: AAPL) and Amazon (NASDAQ: AMZN), it includes innovative names like Broadcom (NASDAQ: AVGO), a key player in the semiconductor and networking space. With artificial intelligence and digital transformation reshaping industries, the Betashares Nasdaq 100 ETF provides a simple way to ride some of the biggest secular growth trends in the global economy.