If you don't know anything about companies then ETF's are a good option. Broad ones that follow the S&P 500 and Nasdaq have been reliable in the past, but obviously their performance is completely based on how the market does as a whole so it's a bit more of a long term investment.
If ya just wanna yolo then find a company, short the **** out of it, then post all your losses to r/wallstreetbets.
If ya just wanna yolo then find a company, short the **** out of it, then post all your losses to r/wallstreetbets.