The VG Resource

So, I have a question I'd like to ask.
I know a few users on this forum are really skilled at reverse engineering image formats and I'd like to know if they could somehow give me something that could teach me how to do that as well.
Some documentation, or some video, or just a general rundown of the process, whatever is fine I appreciate any help.

I found something not sure if it will help and i don't quite understand it but here you go

https://www.mikeash.com/pyblog/friday-qa...-data.html