The first rule of money is, "Don't lose it". As to what to do with it? If interested in shares, a rule that I like is to invest in companies that make products

The first rule of money is, "Don't lose it". As to what to do with it? If interested in shares, a rule that I like is to invest in companies that make products that you like. Also, hopefully, you can make some assessment about the management of the company. If they are bringing a new product to the market, can you use your expertise to evaluate that product? Michael Burry argues that Index Funds distort the market. Think lemmings. Better to use one's own judgement. Is the sun always going to be shining? No, rainy days always come. In life, you will have both lucky and bad breaks. So make the most of your lucky ones. And don't think you are a genius, when you make a lucky investment. Back to rule #1.