What financial lessons did you learn as an adult that you wish you knew as a kid?

Money is not wealth.
Money is just cashflow
Wealth is acquiring Asset that generate cashflow.

When I was a kid, I saved my money in a physical piggy bank. It was only some time later that I "woke up" and deposited them into a real bank. Even then, I only knew about the simple bank accounts which offer 0.05% p.a. interest. If only I knew about other options which are low-risk but can offer a higher interest...