For a few good videos:
I like that series because it shows how limb lengths impact your squat position
As example, you can see Bryce Lewis with a shorter femur here:
and Layne Norton with much longer femurs there
The Juggernaut series on squats, I find, is very good:
Squat Pillar # 1 | The Set Up | JTSstrength.com
I also like Alan Thrall's videos, except for one thing. He preaches the starting strength school of thought and low-bar at all cost. I personally use the low-bar position but I disagree that everyone should go by it. At some point he says, even with shorther femurs, you only have to keep your back straighter. Sure, but in real life you can kill your arms and shoulders doing that. You're basically doing a high-bar squat in a low-bar position. Bryce Lewis talks about that in his video. For him, the low-bar feels just wrong because he isn't built for that.
How To Squat: Low Bar
Fix The Good Morning Squat - High Bar - Pivot Blocks
I also like Greg Nuckols' articles:
How to Squat: The Definitive Guide • Stronger by Science
Wealth of knowledge.
There's plenty of other good videos. Each squatter has his own cues. I like to try as many as possible and see what works for me. Also, film yourself and you'll very likely identify your own mistakes. I like the technique app made by hudl. You can draw lines, slow down your videos and whatnot. I like to film from different angles, as well. Make sure the bar is over mid-foot. I'd say that's about the only thing that's constant for all good squats. Other than that, you have to go with your body and mobility.