Just drag the sliders to the left and right to see what which LUT makes out of the image. The left side is always the original image and the right side the lutted version. If you hover over a slider it shows the LUT name.
About the LUTs
The LUTs are carefully created to match the GoPro Hero 7 & 8 as good as possible. Under normal use cases, they shouldn’t break your footage. It’s important that you set your GoPro to the Flat color profile. If you set it to GoPro Color, the footage might be oversaturated and too contrasty!
You’ll find mostly modern high-contrast looks and some orange and teal as well. The non orange and teal LUTs are great to preserve your green tones. For the best results, I recommend using the same look for all clips in one scene of your video. That makes it look more professional instead of if every clip has different colors.