Begin with a case book which gives complete scenarios of plays and how certain rules are interpreted to come to the ruling in a real life situation. As you progress, you realize that you must understand the “Definitions” as something like a “catch” isn’t as simple to define as the single word it is. You will then find the rules, the penalties/awards for those rules, and finally the exceptions to the rules. These layers are what makes it challenging at times to have a complete understanding of the play. I think of the case books (many different versions are available depending on what age group you are doing), as sort of the old school “Cliff notes” which would summarize the main topics for books more concisely for you.
When a right-handed pitcher makes a pick-off attempt to first base after the coming set, is it ever permissible for his pivot foot to remain in contact with the rubber? Basically, I was questioning a call in my son’s game. The pitcher came to set and stepped towards first but his right foot didn’t come off the rubber. I have always been taught that the pivot foot must clear the rubber before a throw first. Am I wrong?