What is important with regard to the official registration plates?

You answered completely correctly. Official registration plates must be firmly attached to your vehicle, always remain clearly legible, and, for the rear plate, must be illuminated in the dark. These rules ensure that the vehicle can always be clearly identified, which is important for safety, law enforcement, and traffic monitoring. Plates that are not securely attached, difficult to read, or not visible at night can result in penalties. Always regularly check that both plates meet these requirements before driving.