Push your butt back as you bend your knees, grasping the barbell with your hands just outside the hips, with the shoulders slightly in front of the bar. Have both palms facing you, or if it feels more comfortable (or you're lifting very heavy), turn one palm facing out. Keep your back straight, not curved or arched. Your chest should be parallel with the floor.
Stand up, raising the hips and shoulders at the same time, lifting the barbell off the floor so the bar moves over the middle of both feet.
Keep the heels down and make sure to fully extend the hips and knees to straighten the legs. This completes one rep.