How do you change left side headlight on 2005 Mazda 3 hatchback?

To change the left side headlight on a 2005 Mazda 3 hatchback, first, open the hood and locate the headlight assembly. Disconnect the negative battery cable for safety, then remove the plastic cover or the headlight assembly by unscrewing any retaining screws. Carefully disconnect the electrical connector from the old bulb, twist the bulb socket counterclockwise to remove it, and replace it with a new bulb. Reassemble everything by reversing the steps, ensuring all connections are secure.