Back in 1988 I had a school project with a few people, one of whom came from a wealthy family. The project was regarding the stock market, and each team was given a certain amount of imaginary money to invest, to see who would win out at the end of the semester. My friend with the wealthy family came back with a recommendation from his father, of course, and we won the contest easily.
The recommendation? Put all our funds into Berkshire Hathaway.
I had the golden goose egg right in front of me and never invested a dime.