Breathing and bracing, learn it and do it 100% of the time. Video below.
Keep that bar as close to your shins as possible (start over midfoot from your perspective and pull straight back). It looks like you are swinging the bar out in front of you to avoid your knees. If you setup right you won’t hit your knees.
Drive through your heels, not the middle of your foot.
It looks like your doing two lifts. First with the legs and then with the lower back. Fire your glutes and focus on driving your hips forward in one smooth motion. If you do it right you will tag your nads with the bar.