It's common knowledge that squats help to build your leg muscles (including your quads, hamstrings, and calves), but they also create an anabolic environment promoting body-wide muscle building. This is the the exection of effective squats are important to improve both your upper and lower body strength (and visual conditioning).
So ensuring you are performing an adequate (and safe) squat should be your main priority. Even veteran and professional weightlifters often find that there form can use improvement. The biggest reason to check your squat is overall health and safety of your joints. As squats is a compound exercise that provides total body conditioning, it can also very quickly incapacitate a gym goer is appropriate steps are not taken to effectively complete them.

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Much respect to Matt Ogus for putting the below video together! Be sure to check out his other channels and subscribe!

1. Wearing the Wrong Shoes
2. Trying to Barbell Back Squat when you can't
3. Assymetrical Lift Off
4. Ballerina Walk Off
5. Staggered Stance/Unrack
6. Over-Arching your back
7. Being Complacent (caving knees/disengaged hips)
8. Assuming The Knees should never go past the toes
9. Elbow Position
10. The myth of constant tension