the.com/yellow belt

means An early rank in martial arts (often the step up from white belt) signaling you've learned the basics but are still very much a beginner.

from Belt ranking systems come mainly from Japanese martial arts like judo, formalized in the late 1800s by Kano Jigoro, who introduced colored belts (or sashes) to mark skill progression instead of relying on vague seniority. The popular legend is that belts darkened naturally over years of unwashed training sweat and grime, with white eventually turning black through sheer use — a charming story, but not the documented reason; the colors were deliberately assigned as a grading system, not earned through dirt.