New Folders
To create a new folder, start by going to your desktop. Press and hold the keys Shift>Command>n in that order (see below).
A folder that says "untitled" will appear on your screen. Just type the name of your folder and hit enter on your keyboard. To add items to your folder, select them with your mouse and drag them in.
Desktop Backgrounds
To set the Background on your desktop, you first need to select the System Preferences icon on the dock of your computer screen.
Next, you select "Desktop and ScreenSaver" from the list of icons.
From there you can choose from one of the pre-selected photos, or you can upload one of your own images by dragging and dropping it into the box in the upper left corner.
If you select the button that says, "Stretch to Fill Screen" you can choose how large you want the image to appear when it is on your desktop.
It's that easy! There are more features and options you can use if you just explore. Once you know the basics, it is easy to find out how to customize your computer.