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If we start the "what else" branch, it's almost infinite.

For example, the ways to manipulate people and how to protect oneself (e.g. according to Cialdini's classification, but not necessarily).

How to develop critical thinking in a world where most communication is aimed at influencing you in one way or another.

How to develop elasticity and the skill to adapt to ever-changing circumstances (hint: the world they will be living in will be very different from the one they're taught about at school, I think we all experienced it at some point).

How to understand the conditioning of the society and the culture we're living in (e.g. the roles of the husband/wife, parent/child, family member, colleague, boss) and learn to live with them without getting too serious about them (and save a few bucks on psychotherapy later).

How to save money. Only those few who care about you will teach you how to save money, everyone else wants you to spend your money. Etc. etc.