Answer:
Step-by-step explanation:
The most important tactic he used was speed. Everything happened quickly. His enemies were still fighting the First Great War. France for example, had the Maginot Line, which would have been great during WWI because the fighting in that war was mostly in trenches. Mobility was not a factor. And even alowing for that, when WWII broke out and Hitler was ready to conquer France, he simply went around the Maginot Line by way of Belgium.
Hitler understood the value of an air force. He planed in advance how the plane (particularly the fighters) could best be used. Since he did not value human life, bombers were built that could deliver punishing blows. England was playing catchup but Churchill understood he needed planes for immediate defence. He had a Navy, but the war in Europe was not primarily a naval battle. It turned out to be an Army / Air Force battle.
Hitler was driven by a kind of hatred that was focused mainly on Aryan superiority and every other kind of human was worthless. That made him relentless in his goals.