Lotsa good info available on the YouTubez for squatting. Mark Bell has an episode with Chris Duffin that is pretty fantastic. Alan Thrall has two phenomenal squat videos, interestingly enough it shows a progression in his technique.
The first video talks about depth by going ass to grass and really utilizing the bounce.
The second video is a year or two later and he shortened his depth by a fair amount to just below parallel, with the intention of using stretch reflex in the hammies instead of bouncing out of the hole.
Beyond that he talks about proper foot width and positioning as it pertains to knee alignment.
Greg nuckles also has an extremely in depth article about the fundamentals of squatting:
https://www.strongerbyscience.com/how-to-squat/
Last edited by Donat3llo; 04-22-2019 at 12:28 AM.