Don't forget to teach them how risks and rewards work. They need to know that a big return will include a big risk. It's surprising how many people think that they can get huge returns without taking any risk. That's a good way to lose money. Also teach your teen about the beauty of compound interest.
Compound interest is the secret ingredient of building wealth.
Conversely, they need to learn the risk of compounding debt. They'll learn this lesson before they die. Help them to learn it without pain. Teach them that borrowing money obligates them to pay the loan back with interest. And that credit cards are set up so that they keep making payments each month without ever paying off the debt.