Best tutorial ever for MASTERING texturing skills?

Mixu

As in the title, what is the best tutorial for you guys?

I already have some knowledge about materials and other technical things like proper pbr values, etc. but sometimes I struggle a lot about copying the exact look of real surfaces. I know the best way is the practice and a lot of observing real stuff, but maybe there is THE ONE video/article which can drastically speed up the process?