As a child I think I first learned about money by observation. When I went with my mom or grandma to the store or market, I used to be curious how a piece of paper could be used to get some meat or fish. That's probably the earliest time I learned what money actually is. And then there were also those moments when relatives give you money to buy something. Those were the earliest financial encounters I had. And then later on I wanted to buy some stuff which I had to save for first. That's financial management.
But you have probably relied on parents and teachers/educators to learn how to learn? If you're trying to teach someone something it's sometimes good to get near your limits of knowledge (especially if they're engaging with it and asking questions) and then allow them to grow from there. This might be a bit selfish though as it means they'll probably bring interesting facts of things you don't know and may find interesting or start to ask for help determining whether something is factual.
Yes of course, parents and teachers are also there for the guidance. But I guess many of us probably encountered money even before we went to school, even before we were good in numbers. Those games like when a friend acts as a store cashier and somebody buys some stuff using leaves as money and we also give change are like practical games. That's what's going to happen in real life. We just have to learn some math and that's it.