
Management: Tasks, Responsibilities, PracticesManagement is an organized body of knowledge. "This book," in Peter Drucker's words, "tries to equip the manager with the understanding, the thinking, the knowledge and the skills for today's and also tomorrow's jobs." This management classic has been developed and tested during more than thirty years of teaching management in universities, in executive programs and seminars and through the author's close work with managers as a consultant for large and small businesses, government agencies, hospitals and schools. Drucker discusses the tools and techniques of successful management practice that have been proven effective, and he makes them meaningful and easily accessible.
The Effective Executive is great as well. It's hard to narrow down because he was such a prolific writer. Recommendations are also hard because you've got to meet the reader where they are. I picked up and put down Drucker early in my career. Years later, the same pages burst with insight when I read them.
If you want to understand the business world, the management aspect of it, I suggest reading Peter Drucker's Management: Tasks, Responsibilities, Practices.
If you want to get better at networking, I would suggest reading Dale Carnegie's How to Win Friends and Influence People.
If you want to understand marketing, I would suggest, Marketing: An Introduction by Philip Kotler
Peter Thiels' book Zero to One might be a good starting point to understand the start-up world.
But for a general instinct about business, you have to stay curious and learn how people think and behave. Being curious about anthropology, psychology, economics, news, trends, sociology are key.
https://www.amazon.com/Essential-Drucker-Druckers-Management...
Books that I'd recommend: Anything by Peter Drucker, The Five Dysfunctions of a Team by Patrick Lencioni, Made to Stick by the Heath Brothers, Blue Ocean Strategy by Kim and Mauborgne, among others. I'm sure plenty others here will also give you other recommendations that seem more 'start-up' like too.
http://www.amazon.com/The-Essential-Drucker-Management-Essen...