So that person found a business idea worth solving, learned to code and launch a product and made 700k all in 6 months. Surely worth a post on its own. Or was

So that person found a business idea worth solving, learned to code and launch a product and made 700k all in 6 months. Surely worth a post on its own. Or was this person already an expert in a certain business domain, which helped to come up with a business idea in that domain?