Finance is the management of resources such as land, improvements, equipment, and money; the management of usage of resources including investments, debts, and expenses; the management of risk affecting the resources; the accounting for assets and liabilities; and the management of cash flow. Of course there are other topics and a lot more depth to each of the ones already listed here.
We should be teaching children, especially teenagers, how to manage their personal finances at a minimum. Some schools already have classes for this. The schools that don’t already have classes for this, should add them.