Blue belt is a significant milestone. It means you are a base level Jiu-Jitsu player. To me, this means you are competent in all basic situations and can apply your skills on the feet, on the ground and on the street.
Becoming a blue belt is no easy feat, not only because of the effort, focus and hard work required but because there are very few good roadmaps for getting there.
As a student coming up in Jiu-Jitsu, particularly given my unstructured BJJ upbringing, I always craved a complete, structured guide from white to black belt - and all the steps along the way.
To try to find something like it, I sought out and studied the curricula of every highly regarded black belt I could get my hands on to try to see what they considered fundamental - and what basics I was missing.
With every curriculum I studied, I'd pick up a new detail, variation or wholly different way of doing things, but no one had everything. Most Blue Belt curricula, if they exist at all, contain 50-120 techniques.