I saw on somebody’s post that you recommended taking the slack out of the bar when deadlifting. What is meant by this?
It means you need to put pre-tension on the bar before you pull it from the floor.
Follow the 5 step set-up like here : https://youtu.be/wYREQkVtvEc
Just before you pull the bar from the floor you put tension on your body so everything is pulled tight. Like here: https://youtu.be/D_2RjBQBBrw