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The Status Bar Go to the File menu and choose Open, locate an image file and open it now. If you don't have an image file handy, you can find several in the Stockart folder of the Photoshop application CD. Ctrl-O is the keyboard shortcut to open a file. This is the same shortcut used by most applications, so it should be an easy one to remember. If you are a Windows user, you can quickly open a file by double clicking on the application background.
To the left of the magnification display on the status bar, you will see a display of document sizes. The number on the left displays the uncompressed size of the image if it were to have all layers flattened. The number on the right displays the uncompressed size of the document including all layers and channels. It's important to know that both of these numbers will usually be larger than the final file size of the saved document. For more on the Document Sizes display, look up Document Sizes option in the online Help file.
Next in the status bar, you can see useful information about the tool you have selected. If you still have the zoom tool selected, your status bar should say "Zoom In" if you are outside of the document area. Move the cursor into the document area and you will see the status bar display instructions for using that tool. Now hold down the Alt/Option key and the status bar will show "Zoom Out" and the cursor will change to a minus sign. Next try the Ctrl/Command key in conjunction with the zoom tool and observe the tips displayed in the status bar. Try the other key combinations such as Ctrl-Shift/Cmd-Shift, or Ctrl-Alt/Cmd-Option while observing the status bar instructions. Let's review each of the zoom tool options: Here are a few more zoom shortcuts we have not yet covered: |
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To the far left of the status bar you will see the magnification level of the active document. You can swipe your cursor in this area and type in a new number to change the magnification of your document. Go ahead and try it now. 
To return your document to 100% magnification, locate the zoom
tool in the toolbox and double click the button. The keyboard equivalent
to this shortcut is Ctrl-Alt-0. 
Next to the Document sizes display there is a small black arrow that pops up a menu. You'll find this arrow other places in the Photoshop workspace, so when you see it, remember that there is a menu hiding there. In this case, the menu allows you to change what is displayed in this area of the status bar. In addition to Document Sizes, you can optionally choose to display Scratch Sizes, Efficiency, Timing, or the current tool. You can look up each of these items in Photoshop's online Help for more information. 
Hand tool = zoom to fit the screen