I highly recommend a book:
Bread from Stones - Dr. Julius Hansel
A New And Rational System Of Land Fertilizing And Physical Regeneration
It's 123 years old, but it's very interesting and full of valuable information. You can easily find it online in English free of charge.
Another very valuable book:
The One-Straw Revolution - Masanobu Fukuoka
He is a farmer and philosopher who was born and raised on the Japanese island of Shikoku. He studied plant pathology and spent several years working as a customs inspector in Yokohama.
Maria Thun - Biodynamic Sowing and Planting Calendar (Moon Calendar). Incredible author. She died, but the calendar is issued every year on the basis of her long-standing research.