I personally will never short anything. I'm not smart enough to do it right, I proved that to myself when I tried to actively invest. Were I to play the market again, if I were pessimistic about a stock, I would opt to buy Put Options to bet against it. Those come with their own risks, including being able to time the market in addition to its direction. I've seen others say you can buy positions in a ticker that tracks the inverse of Tesla, but it insulates you from the worst case of selling short (i.e. theoretical infinite loss, or at least way more loss than you could afford); it can only drop to zero for a 100% loss, but not more. At least, that's my understanding, but I could be wrong. The advice I give myself is to just not play, except in the most boring way.