The S&P 500, or Standard & Poor’s 500, is a stock market index that tracks the performance of the 500 largest publicly traded U.S. companies. It requires next to no effort: S&P 500 ETFs are passive investments, so you never need to worry about choosing stock or deciding when to buy or sell.
But there are drawbacks to investing in the S&P 500. If you're planning to invest money you'll want to use in another year or two, putting it into the S&P 500 leaves you at risk of losses. The stock market is volatile, and it's impossible to predict what will happen in the future.
That said, if you're investing for the long-term, you can still benefit from the S&P 500. I'd aim to keep investing an additional $500 a month in that same S&P 500 index fund on top of my $36,000 lump sum invest. If I earned 10% a year, that would be an extra $2,400 in profits.