The headlights are like the eyes of your car. Without them, you cannot possibly have a smooth drive at night, as you will be unable to see where you are going. So it is important to have a good set of headlights ready for your car so that you will be able to drive without any worry at night. The headlights are an intricate set of machinery that have a built-in assembly of parts which keep it functioning smoothly. If you do not take care of this assembly, you could damage these parts and would have to replace the entire assembly.
Taking care of the headlight assembly just means driving carefully and not moving over rough roads. Bumpy roads are the worst enemies of headlights as the screws get loosened over time, and then without any warning, they will suddenly fall off, right on the road. The bulbs may be intact inside, but the domes will fall off quite easily and you will be none the wiser until you get down and notice it, or someone points it out. So while driving on rough roads, remember to check the headlight assembly for any loose screws or any damage which might have weakened the entire assembly.