Don't let them think they can make money buying and selling Bitcoin.
Explain that Bitcoin is not just a currency. It has network characteristics and program characteristics. It is actually an agreement that allows users to conduct transactions without the assistance of a trusted third party.
I usually say that if it is a kind of future, the sooner you understand and learn it, the better, and you can learn more at a young age. The desire to learn is restricted as you get older, and older people always hope that things don't change.
Human beings have been learning money unconsciously from birth to adulthood, and Bitcoin is very different from previous learning experiences, especially the characteristics of not requiring a third party make it difficult for novices to understand. They always want to use Bitcoin roughly. The currency is stored in a third-party institution until the loss occurs.