https://taylorpearson.me/thedragon/
The basic idea is that you create a balanced portfolio of assets that are negatively correlated with each other so that, over a very long time horizon , your wealth retains its value even in the face of uncertainty, black swan events, and volatility. An example would be owning an equal proportion of stock, cash, bitcoin, gold, fixed income, commodities, and volatility. (Harder for the average person to get exposure to commodities and volatility - but I think bitcoin checks those boxes).
Edit: include original paper that describes the portfolio by Christopher Cole: https://docsend.com/view/taygkbn