You don't have to "learn an industry", you only have to be made aware of a problem in enough detail for you to solve it. That can be done by learning an indust

You don't have to "learn an industry", you only have to be made aware of a problem in enough detail for you to solve it. That can be done by learning an industry, but that's the expensive way. Cheaper is to have broad first-hand experience, or a large network of people who will tell you about problems that need to be solved in their industry.