More generally, it's often worth learning and understanding things one step deeper. Having a more fundamental understanding of things explains more of the "why" behind why some things are the way they are, or why we do some things a certain way. There's probably a cutoff point for balancing how much you actually need to know though. You could potentially take things a step further by writing the backwards pass without using matrix multiplication, or spend some time understanding what the numerical value of a gradient means.