You probably didn't actually learn what capitalism is either until later, given that Marx is the most comprehensive breakdown of how capitalism functions, so much so that even the economics courses at universities use Marx for that part.

The intentional avoidance of teaching how the system works is essential to making sure people don't question it. You don't want your workers knowing how it works, merely accepting it. Understanding how it works is reserved for the ruling class.

I tended to have communism/socialism condescendingly poopooed as "well-meaning" but "never really working because human nature".

Anyways, time to learn about the french revolution and the reign of terror, which in no way should be viewed as an indictment of liberal revolutions the way the red terror does for socialism.