Skillful drawing

Current art is becoming increasingly popular. It seems that now, more than ever, many thousands of people are covered with a rush to draw. This impulse applies everywhere. For someone, art is entertainment, hobbies, and someone would have earned them for life with doubtful certainty that his abilities will bring success. There are certain components of skillful drawing, without which it will not be successful. I am sure that this component can be taught. Until now, I could not find a drawing allowance, which would describe the relationship between proportions and prospects with light and shadow. And since these components are very deeply interdependent, then the real book describing their relationship can give answers to many questions