Here are books that I recommend if you want to consider yourself an educated coach. All these books are books I find myself referring to on an ongoing basis. Some are classics and some are contemporary. No doubt they represent my bias and my background in Track & Field, which has served me well in my career. There are a few more I will add later.
→ Sports Training Principles: An Introduction to Sports Science by Frank Dick
→ Biomechanics: A Qualitative Approach for Studying Human Movement (4th Edition) by Ellen Kreighbaum
→ Dynamics of Skill Acquisition: A Constraints-Led Approach by Keith Davids
→ Science and Practice of Strength Training by Vladimir Zatsiorsky
→ The Chimp Paradox: The Mind Management Program to Help You Achieve Success, Confidence, and Happiness by Steve Peters
→ Lore of Running, 4th Edition by Tim Noakes