What German war strategy was based on the concentrated air and land attacks and provided a powerful punch through enemy lines?

The German war strategy you are referring to is called "Blitzkrieg," or "lightning war." This tactic emphasized rapid and coordinated assaults using a combination of air power and fast-moving ground forces, particularly tanks and infantry. The goal was to penetrate enemy defenses quickly and disrupt their ability to respond, leading to swift victories. Blitzkrieg was notably employed during the early stages of World War II, contributing to Germany's initial successes in the conflict.