Yeah, the documentation is very sparse. I think it was originally all in Simplified Chinese, but some things have been translated to English. Basically it gives you tools to fix subpixel font rendering issues on windows. Using a rotated monitor? An OLED monitor? A TV? All of these are examples of screens that don’t have standard subpixel layouts, so fonts tend to have weird color fringing as a result. MacType allows for a lot of tweaks to how fonts are rendered, but I tend to just switch to grayscale rendering, which works well.
This reddit thread walks through the process with some specific configs and they have pictures to show how it changes things.