Shame on me for forgetting:
21. Basic understanding of electricity.
22. How to drive a nail, drive a screw, cut a board, build a box.
23. How to drive a car in the winter, how to pull a car out of a skid.
24. How to ask for help.
and, best of all: Probability.
Thanks to: Textiplication: Top 1000 Things You Need to Know.
Can I add a few more?
25. How to read a table and a chart
26. How to read the media for spin and for insight
27. The importance of doing things for other people.
(yes, this one among others is mostly a parenting job, but yes, it can be taught)
28. How to work really really hard, sometimes on things that aren’t fun.
29. What it’s like to be in jail.
30. How to create an internal dialogue that makes you happy.