To help you apply these principles to a specific or combat scenario :
A specific technique you'd like to refine (e.g., the lead straight, footwork). Jeet Kune Do: The Principles of a Complete Fighter
Your current martial arts background (e.g., beginner, boxer, grappler). To help you apply these principles to a
Dominating the vertical line of the body to protect vitals and open paths for strikes. the lead straight