Here are some good videos from the NRA on Firearm Science

These videos have good information for both beginners and advanced shooters.
FIREARM SCIENCE: AIM FIREARM SCIENCE: PROPER GRIP
FIREARM SCIENCE: PROPER STANCE FIREARM SCIENCE: RECOIL EFFECTS
FIREARM SCIENCE: TRIGGER CONTROL FIREARM SCIENCE: MOVING TARGETS
FIREARM SCIENCE: BULLET SPEED FIREARM SCIENCE: PRESENTING FROM CONCEALMENT
FIREARM SCIENCE: POINT OF IMPACT VS. POINT OF AIM FIREARM SCIENCE: REVOLVER MECHANICS