The five rules exist because I spent thirty years learning them in the wrong order.
I started selling long-distance calling cards in Hamilton in 1994, which taught me that a product nobody can find is not a product. Dropshipping taught me the second thing: you can own no inventory at all and still lose the year on returns. Then warehousing, cross-docking, and consolidating less-than-truckload shipments into full loads — a business where the entire margin lives in whether the dock is ready when the truck is. Every one of those broke in a different place. That is the whole premise of this site. The five rules of a subject are not a countdown with two you are quietly allowed to skip; they are five separate ways the thing falls over, and getting very good at one of them will not save you from the other four.
So the register here is loud, because I have sold things for a living since I was nineteen and I am not going to pretend otherwise. What is underneath it is the advice I would give someone who actually had the problem on a Tuesday: specific, unglamorous, free, and complete. There is no upgrade, no sixth rule held back, nothing behind anything.
The man in the yellow band is a costume. The arithmetic is not.