Here is my drill bit basics video to go along with my basic machining class at Parkland College. Check out the other videos in the series:
Reamer Basics: https://youtu.be/V9jFWDxC70A
Countersinks and Counterbores: https://youtu.be/SbGG98P_cS4
Endmill Basics: https://youtu.be/Y9Qi29WqOCs
Consistent Countersinks and Spot Drills: https://youtu.be/AzQ8LC1I6G4
Class handout: https://drive.google.com/open?id=1znUW5LbVoUxChDC_tguntelb19g16gOZ
