I'll give it to you where I'm at.
Level zero. Mong hitting a piano like a 3 year old that just wants to hit shit.
Level one. Hitting stuff and it sounds good. Avoid the black keys
Level two. Learning chromatic scales. A little bit of dynamics with bass hand. (This is where I'm at.)
Level three. Knowing major, minor, blues, and mylmxlodian, pentatonic, with a good control of bass.
Maybe some classical bullshit, but that's a different grade.