re: Beginner investors. My 2 teen kids.

The big lesson, in my opinion, for young folks to learn is the value of time value of money. And the return (1 + k)^n, as in “k”, is less important than time “n”.

In balance of enjoying life, nature of the accuracy of predictive value of financial markets, and realization that time is most precious resource, it is less important to take precious life and spend it maximizing return and, instead, just making regular investments into index funds over time.

Less “fun”, yes. More effective, “yes”.

Teach them to live below their means, invest the difference, explore index funds with broad risk (see Boglehead approach), and make it automatic.

The end.