[bahman2000]

There are MBA programs that are specifically tailored for entrepreneurship, such as the Babson College program (disclaimer: I am an alum).

For instance, there are specific tools and frameworks that, when used properly, help you identify the opportunities worth pursuing.

Further, you can be an entrepreneur in both cases: when starting your own business, or working for a large company. It's true the other way too: you can start/have your own business and that wouldn't make you an entrepreneur.