> Not financial advice, but: Honestly it’s pretty hard and I wouldn’t recommend it. Shorting stocks and getting into bonds / default swaps but the system is broadly rigged against small players doing well here. Ie in the Big Short see everything that was needed for two guys to bet with their own money.

Do you base your knowledge on anything other than a very mediocre movie?

If an "investor" believes the market will sell off drastically, there are many, many ways they can express that bet in the open market. They can short index futures, buy put options, long volatility... so many options that depend only on the thesis being right. It does not sound as sexy as "look kid, the billionaires rigged the system!", but it's true.