An article looking back at Buffett's time at Berkshire Hathaway highlights his long-standing advice to just buy the S&P 500. He specifically recommended Vanguard's VOO for its low 0.03% expense ratio. The index is very top-heavy right now. Information technology makes up 36.6% of the S&P, driven mostly by Nvidia, Apple, and Microsoft. Tech has been carrying the market recently. Over the last 3.5 years, the S&P 500 returned 101%, but if you take out the tech sector, that drops to 63%. They also ran the math showing how a $20k investment at age 25 could hit over $1.1 million by age 65 just by matching the historical 10.7% average return.