What did blitzkrieg depend on?

First off the Ju-78 or Stukas Did their bombing of important positions of enemy like bunkers trains etc. Then The Panzers or tanks went ahead as killed all the infantry. While The mechanised infantry was watching the panzers back. But the attack didnt stop the panzers and planes went ahead while little bit of panzers and infantry stayed at the sides to protect the trucks that resupplied the troops.