While people learn different things in different ways, business is one activity that I firmly believe is best learned while engaging in the activity. In fact I feel that most people learn more in one year on the job than they do in multiple years of school as so many facets and nuances of business really cannot be taught in books or a classroom setting with fictional stakes. The rubber meets the road when working with real people (who have real families), real clients, a real balance sheet, and a real income statement.
The book contains a wealth of insight from startup founders and business owners such as Ben Horowitz (Andreessen Horowitz), John Collison (Stripe), and Joshua Reeves (ZenPayroll). While it is free do not let that influence your thoughts on the value. These lectures have provided me tons of inspiration as well as great career advice. I urge you to give it a read and then follow up by listening to any lectures that strike you for even more insight.
Best of luck.