What Bitcoin topic do you think beginners usually overlook the most?

A lot of new people entering Bitcoin seem to focus mainly on price movements at first, which is understandable.

But after spending more time learning, it feels like some of the more important topics are things like self-custody, privacy, mining, decentralization or how the network actually functions.

What part of Bitcoin do you think beginners tend to overlook early on, but later realize is important?