Safety shall be present in our day-by-day activities, at work or home (and in-between :) ).
I work in an office, so I pay attention in the electrical installations conditions, light levels and ergonomic posture, however I also pay attention in the way I take to arrive to office (quality of roads, objects that can take to falling, leaking in the floor, stairs, traffic) and to the people around me.
I usually alert facilities or EHS teams if I see something that might be an issue.
Usually accidents occur when people are distracted or if someone thinks it is "other people" obligation to take care of that.
Knowing first aid actions and emergency channels are also essential.
I hope it helps :)