Chad Vaughn goes over the the basics of & reasons for the (Olympic style - as low as you can, as upright as you can be) squat. Show that to people saying that you shouldn’t squat below parallel.
Non Evans would approve that DSP.
In another videos he discusses proper set-up and common faults when performing the Olympic lifts.
- stance, setting back - flare knees out, to set hips down
- breathing, take a deep breath before you go