Hello guys, I'm currently 22 y/o, just graduated Uni. Over the years, I managed to save up tons of money by living with my parents since my Uni was in the same city. I'm looking to invest quite a bit. I'm new to the stock market and everything, someone recommended that the S&P500 are a great long-term investment option. How trustworthy is this? I'm looking for a long-term investment, should I go with S&P 500 as one of my options?