Tips for better squatting

So i am looking to get better with squatting at the gym. I never really used to train my legs as much as my upper body
I’m looking though to improve my core, upper back, glutes, and quads.
This is why i want to learn about different squat variations
how many of you do good mornings? also what about weighted split squats and breathing paused squats? are these all good exercises to increase my leg power and also core strength