What is the best way to teach your kids about money/personal finance?

I have two young ones. Aged 5 and 3. The younger one in preschool and the older one is going to primary school next year. I was thinking about how to inculcate a good habit in them when it comes to teaching them about how valuable money is for themselves and how it is not easy to earn. So they don't have the idea that money drops from the sky. I'm asking now because I hope that the older one can be a role model for the younger one when he goes to school also. Interested to hear from other parents or people who have been taught good lessons by your own parents? Thank you to the community people!