Assuming subjects and skills refer to book-learned knowledge rather than life experience: I'm trying to decide what to study in college or through MOOCs like those offered by EdX or Coursera or whether or not I should choose a business or a non-business major. I am trying to decide what to focus on. If I self-studied instead, I wouldn't have any debt from my degree but could still need a degree for other reasons. What specific topics are essential for entrepreneurs to know? For example, there's a lot to learn as a finance major and I'm not sure which topics would be relevant for entrepreneurship. I've tried thinking about it in other ways, for example: "What should a successful entrepreneur/CEO be able to do?" and tried to figure out which subjects will teach me the skills I'll need to achieve those goals.
The most important always is SELLING. You will start on your own and will you will have to do a lot of things. But there is one that is the most important and the one that will make your business happen, and that is selling. And also is the one you can never outsource. Of course you can grow and have people in your team doing the commercial work but the entrepreneur is always selling.