Breaking down the 4 muscles of the quads and the type of exercises pertaining to develop each muscle group.
Rectus Femoris occupies the middle of the thigh w/c originates from the Ilium. Personally, I do a lot of back squat & forward lunges to develop it. Leg press is also a good exercise in developing your quads.
Vastus Medialis (Tear Drop) is the muscle above the knee. Everybody wants the tear drop. Bulgarian split squat & leg extension are great exercises to develop that tear drop.
Vastus Lateralis is the outer side of the thigh. Squat & leg extension are great exercises targeting this muscle. When performing squat & leg extension, I turned both my feet about 30 degrees out.
Lastly, the Vastus Intermedius lies between the Vastus Lateralis & Vastus Medialis. Personally, squat is the best exercise to target this muscle.
There are many exercises for the quads & everybody have there preferences.
I prefer building my legs using compound exercises. Mostly, squat, lunges and deadlifts. On occasion, I do leg presses, leg extensions and step-ups.