How do I replace the air filter in an Audi A4?

I just bought a used Audi A4 and want to make sure I am maintaining it correctly. How do I easily replace the air filter in my car?

To replace the air filter in your Audi A4, first open the hood and locate the air filter box, which is typically a black box on the driver's side of the engine. Open the housing and carefully remove the old air filter. Make sure to clean out any debris and dust from the filter box before placing the new air filter in. Close the housing and enjoy cleaner air in your car!