Youtube Flintknapping instructional series of videos.
I found this interesting.
Multi part series on flint-knapping.
Jim, a guy with 30 years flint-knapping experience as a hobbyist shares his knowledge - including going into the dynamics of the flaking process, qualities of different stone, tools used etc;
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects."
— Robert Heinlein.