I had to read half of 'Phenomenology of the Spirit' for my Metaphysics II class. And I read the other half on a combo of Adderall and Acid.

And other people interprete that section differently, I am only going off of what the class consensus was about what the fuck he was talking about.

It's basically a retread of the old Ship of Thesius problem. If your mind can change, and ideas can change, are you still really you? And by what mechanism can these ideas of self change, when you are dealing with a paradigm of Platonic ideals? After all, previously Kant proved that even if they do exist, we can only have limited access to them through logic, but if we assume they do exist in a platonic form, then how do they appear to change?

Marx just turns the whole thing upside down and says, this is silly, ideas clearly change over time and do not exist in some platonic vacuum somewhere, and they change because they are directly influenced by the material conditions that we, as the makers and keepers of ideas, experience. It is extremely refreshing to read Marx after Hegel, because he is extremely clear-cut in comparison.