How do you change spark plugs on 06 Hyundai Sonata?

To change the spark plugs on a 2006 Hyundai Sonata, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil by unscrewing it and gently pulling it out, then take out the old spark plug using a spark plug socket and ratchet. Install the new spark plug by hand to avoid cross-threading, then tighten it with a torque wrench to the manufacturer's specifications. Finally, reattach the ignition coil and reconnect the battery terminal.