Where can I find the official documentation of macOS Kernel Debugging? I want to study kernel debugging on macOS, and hence have tried to find official documentation for macOS Kernel Debugging.

Currently, I'm only able to find up-to-date or complete information on third-party blogs, but I'd rather read the original source.

Windows provide such information freely available as part on its site - doesn't Apple do the same?
Yes, Apple does the same...

You can read the documentation here:

https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/build/build.html#//apple_ref/doc/uid/TP30000905-CH221-CIHBJCGC