Many investors like the simplicity of investing in index funds like the S&P 500, a collection of 500 companies that are representative of the overall stock market
You know the saying “Don’t put all your eggs in one basket?” That applies to investing too. To achieve the same gains with less risk, you’ll want to diversify your stock market investments.
It’s supply and demand. Prices go up when there are more buyers than sellers. Prices go down when there are more sellers than buyers.