One of the most important non-technical skills with owning a computer is knowing where you save things. Where are your photos and documents? Where are your saved mail messages? If you use Quicken or Quickbooks where is your working file or backup? In the event you lose something, you won't be able to find it if you don't know where it is. Just think about if your car was stolen, but you can't tell the police where it was or where you kept it. They wouldn't be able to help.
Familiarizing yourself with your file system is easier than you think. Click on the Finder on the lower left corner of your Dock and this opens the map of your computer where you can search, organize, and open files. If you need to search for a missing file, you can use the spyglass in the upper right of the Finder window or even up by the clock in the Top Bar.
Taking some time to know where your most important things are kept will go a long way to not only help preserve that data, but also boost your confidence in knowing where it is.