That's 80% of the thing right there.

School! Teachers! Classes!

Seriously, the traditional higher ed system is still a very good place to learn things like this. (I honestly tend to forget about it since academia hasn't really caught up at teaching software engineering, but that's really the exception rather than the rule ...). For traditional subjects like finance/economics, you can absolutely find inexpensive extension courses taught by people who care about pedagogy.

ETA: it's a joke because the original saying is "those who don't know history are doomed to repeat it"

Some people (particularly criminals and oligarchs) might not like them, but most of the structures around financial movements exist for very practical reasons, often stemming from the will to uphold the rule of law. Obviously nothing is perfect (the US have an excessive level of control, VISA/Mastercard are de-facto monopolies, etc etc), but one cannot seriously think that the way to fix things is to reimplement everything from scratch in a wild west of shady unaccountable operators...