Any Recommendations For Legit Modern Ecommerce Business Training?

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I've sold physical products online before, but it's been around 18 years. A lot has changed with the new providers for research, sales, advertising and distribution. A lot more competition now also....

Anyone have a recommended course or source for learning the build of a modern physical product business? I'm mostly interested in learning the current methods of identifying opportunities, product sourcing and product fulfillment.