Buy/sell/short stocks. Warren Buffet said doctors, lawyers are good 'hobbies'. In other words, the only real job to the second richest man in the US is the stock market.
But, YOU are most likely to lose money on the market. Stick to your day job you grinder, and buy an index of the market you like. No mutual fund can consistently beat the market, so don't be a sucker, buy a low cost ETF and follow the market! Don't EVER EVER sell. All investing mistakes can be fixed by NOT SELLING.