Learning about how children tend to do better when their praise is based on their effort instead of abilities. And I feel that’s best shown through Riddler.
Something Riddler always complains about is how no one notices how smart he is but the thing is people call him smart all the time. Batman acknowledges his mind is brilliant, a force to be reckon with, and his Arkham files state that he’s of high level genius IQs. Both examples of praise in his eyes. But no one ever talks about how much effort he puts into being smart.
No one ever talks about the many late nights fueled by coffee and energy drinks in libraries. Or the endless hours trying cramp more facts about Zeno’s paradox while also studying the Egyptian hieroglyphics
And i think that’s why he puts so much stock in his ‘intelligence’ because his efforts never matter as a child and no one seems to notice them as an adult either. All he has left is this hollow idea of what he should be.