Squats mainly work your glutes, quads and hamstrings.
Squat Form Cue
Stand with feet hip-width or slightly wider is good, and toes slightly turned out. Focus on sitting back, while keeping your chest lifted and a tight core. Inhale to lower, exhale to rise. Make sure that your knees go towards your toes, but not far past your toes. Sink your hips as low as your flexibility allows, whether it’s a small squat, or to hips just above knee level. You can squat lower than knee level if it works for you, but generally it’s not something that I recommend.