Basic computer use and maintenance. How to keep essential stuff updated, restore an accidentally deleted shortcut, clear the browser history, install and uninstall a program, locate a file when search is not helping, open the case and blow the dust off the components without destroying anything, troubleshoot common simple issues, and remove garden-variety malware infestations without having to consult a professional.

There was a time when this may have actually been a bit much to ask, but in the age of Google there's really no excuse for a reasonably capable person not being able to figure this shit out.