Best book I ever read on Nutrition is Mandy Tanny's "Bodybuilding Nutrition" - https://www.amazon.com/Bodybuilding-Nutrition-Mandy-Tanny/dp/0060964979

Bodybuilding Nutrition [Mandy Tanny] on Amazon.com. *FREE* shipping on qualifying offers. This unique book examines the diet and nutritional needs of an active athlete, offers nutritional information to fit specific types of exercise

Protein has 4 calories per gram; Carbs have 4 calories per gram - but Fat has 9 calories per gram! 50% P, 40% C and 10% F (in calories) works best for me.