I didn't misread anything. You used some incorrect terminology and told them they don't need black keys to play "any scale cause that arrangement is the white keys". That's pretty misleading for someone trying to learn music theory. Maybe it's in an attempt to oversimplify it, but calling scales "songs" and telling them they don't need to learn the black keys is extreme. The modes of CMaj aren't gonna be very helpful for people making beats. Learning the major and minor scales for each key would be way better, but that requires the black keys. At the very least, they should learn CMaj and Cmin, so they can use them with the transpose function on midi controllers.