How do you replace headlight bulbs on 2009 Audi A3?

To replace the headlight bulbs on a 2009 Audi A3, first, open the hood and locate the back of the headlight assembly. For the low beam, turn the bulb socket counterclockwise to remove it, then pull out the old bulb and insert the new one, ensuring not to touch the glass. Reinsert the socket into the assembly and turn it clockwise to secure it. Finally, test the new bulb before closing the hood.