I used to read business books on the topic of how to become rich etc. but now I know that it's better to take action on the basics of doing business such as marketing a product or service. Maybe a lot of business books are aimed at executives, or the career high-flyer for getting them to think outside of the box?
But I still like to read motivational books such as autobiographies by the rich and famous people. Maybe 1 book every 3 months.
With today's Internet, it's pretty easy and quick to find out how to do things related to business such as creating a company, opening a business bank account, managing finances etc. without reading a book. Also there are case studies to follow on specifics of building various kinds of business.
I never tried it, but it might be worth looking for leaked manuals from successful franchise operations to learn their marketing tactics.