How to deadlift
The pull starts on the floor. Grip, brace, and drive.
The start
Bar over mid-foot, shoulder blades over the bar. Grip, pull the slack out, brace.
The pull
Drive the floor away. Chest and hips rise together. Lock out by squeezing your glutes, not by leaning back.
Common fault
A rounded back under load is a rounding-back habit built at light weights. Reset every rep.