It's embarrassing, but I don't know how to...WHAT?

There are certain things that it just seems like everybody knows how to do...cook an egg, ride a bike...or drive a car, hanging a picture, swim, pump gas, etc. But maybe you never learned how do something and you've been wondering when the heck the rest of the world learned? Do you try to keep your lack of know-how a secret and just avoid doing that task? Are you too embarrassed to ask a friend for help? If you need help learning how to do something you feel like you should already know, we want to help! Tell us what it is you don't know how to do today!