Using the GFX HAT is easy. First, make sure your Raspberry Pi is one of the compatible models (Raspberry Pi 3B+, 3, 2, B+, A+, Zero, or Zero W). Connect the GFX HAT to your Pi. Then, use the provided Python library to start displaying on the LCD, control the backlight, and link functions to the touch buttons. You can refer to the included examples to get a quick start. When it comes to maintenance, keep the display clean with a soft, dry cloth. Avoid using harsh chemicals. Also, be aware that the software does not support Raspbian Wheezy, so make sure your Pi is running a compatible operating system.