This official FAA handbook has been required reading for more than 30 years. Providing basic knowledge essential for all pilots, from beginning students through to the more advanced certificates, this Federal Aviation Administration (FAA) publication introduces readers to the broad spectrum of knowledge required as they progress through pilot training.
https://www.amazon.com/Pilots-Handbook-Aeronautical-Knowledge-FAA-H-8083-25B/dp/1619544733