How do progressively growing business owners grow their own personal business knowledge?

How do progressively growing business owners grow their own personal business knowledge?
How do business owners, that have businesses that experience very exceptional growth figures, keep on top of the necessary business knowledge to help deal with their growth. And to assess whether or not a business should expand operations?? Is their courses, or a series of business books that aid with this type of thing!

Any advise from people who have led rapidly growing businesses is most welcome. Thank you for your time and help.
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