Situations on the road are liquid and change every second. As such it’s important for a rider to have a 360 degree situational awareness.
Look into your rear view mirrors every 5 or so seconds.
You can control what is ahead of you, but it’s hard to control what’s behind you.
Check your mirrors at every change of direction , when you are overtaking, turning , changing lanes , turning a corner and coming out of a corner, also while slowing down and coming to a stop.
Check , check, check.