Breakdown
Here is a quick checklist for the bench press technique:
Squeeze you shoulder blades together
Flair your lats
Use a closed grip (thumb around bar)
Squeeze the bar and try to bend it
Keep your wrists straight
Contract your abs
Squeeze your glutes
Arch your back
Keep your glutes in contact with the bench
Drive your heels into the floor
Keep your elbows tucked
Push the bar in a straight line (push away from your face)