How do you replace spark plugs on 2006 Hyundai Santa Fe 3.5?

To replace the spark plugs on a 2006 Hyundai Santa Fe 3.5, first, ensure the engine is cool and disconnect the battery. Remove the engine cover (if applicable) and then detach the ignition coils by unscrewing them and gently pulling them out. Unscrew the old spark plugs using a spark plug socket, then install the new plugs by hand to avoid cross-threading, and tighten them to the manufacturer's specifications. Finally, reattach the ignition coils, replace the engine cover, and reconnect the battery.