Looking for the j-hooks when racking the squat (or press/bench press)
It can be tempting to look at the j-hooks as you’re racking the bar after your last rep. Don’t. Unless you have an exceptionally sneaky and cruel training partner, the hooks didn’t go anywhere while you were squatting, so stop treating them like they have legs. When you’re finished with your last rep, look straight ahead and walk forward until the bar makes (and keeps) solid contact with both uprights. At this point, you’ll know the bar is over the hooks (assuming you set the hooks at a reasonable height - see the previous paragraph), and you can then safely lower the bar down to the hooks. Looking at one hook makes it very likely that you will miss the other, and this tends to be a rather disastrous event - it might not happen today, but it will happen. Don’t look at the hooks.