Computer newbies
How often haven't I been considered a computer guru for such simple things! Many people are still surprised when they see me use copy-paste, or ctrl-left-arrow and ctrl-right-arrow to move through a text faster.
Copy-paste I learned by simply reading the first few chapters of the manual. Ctrl-arrow navigation and left-arrow in powerpoint I simply learned by trying key combinations. Many people are afraid to experiment with software. Why? Are they afraid that if they press the left-arrow that it will erase half of their slides and give the other slides a purple background?
Look, I've done pretty amazing things with computers, if I may say so. I've written software to compare gene sequences really fast, written nifty code that combines C++ templates with macros to easily get function pointers of a DLL, code that generates other code, and more. If you consider me a computer guru, do it because of those things, not for the simple stuff that everybody should know.