I know some serial entrepreneurs who do decide to just "start" a company. They usually start with fairly broad research, looking into a lot of different industr

I know some serial entrepreneurs who do decide to just "start" a company. They usually start with fairly broad research, looking into a lot of different industries, and then when they hear the whiff of an interesting problem dive really deeply into it. However, doing so requires strong entrepreneurial insights. I don't recommend it for first-time founders, as starting a company for the sake of starting a company is often a recipe for building something nobody wants.