I think this is horseshit.
The reason being: most of what you read online will be heavily modified to support the ideology of the author... which quite frankly, outside of neuroscience, is the biggest problem Economics faces: politics and ideology.
Economics is not finance, nor is finance economics.
Economics is about resource management, and both micro/macro are just that at different levels. The real holy grail of Econ is how merge them, what I think lies I the effects of agglomeration...
If you want to get your white belt in economics: go read something historical, not mathematical. Ricardo, Keynes, Friedman, Smith, Galbraith, Veblen, Marx, Krugman... the math and statistics come easily and intuitively if you understand the theory.
Rates of change themselves don’t make you fluent in economics, showing why the fuck you even need that rate of change is economics.