How do I properly maintain the tire pressure on my Audi A1?

I've recently noticed that my Audi A1's tire pressure is fluctuating and I'm not sure how to properly maintain it. Can someone provide me with step-by-step instructions?

First, check your car's manufacturer recommendation for the optimal tire pressure. Using a tire pressure gauge, measure the current tire pressure and compare it to the recommended pressure. If it's low, add air using a compressor. If it's high, use a tire deflator to release air. This can improve your car's fuel efficiency and prevent uneven wear on your tires.