[Confiks]

If some rich and complex learning material doesn't immediately 'click', that doesn't mean it is ineffective. You might just be laying the groundwork to understanding those complex ideas later, for example when they are connected to other ideas or when the motivation to learn surfaces. Learning is sometimes too focused on 'understanding' and immediate results, while often very puzzled faces and proclamations of non-understanding are the best indication that real learning is going on.