They reduce the number of keystrokes - making access quicker. For example - you might need access to a program that's 'buried' in layers of directories. The 'slow' way to access a program is to type a command line to change the directory until you get to where the program is - then run it. The quick way - is to set up a shortcut on your desktop, to the program itself. Thus saving loads of keystrokes (and time).
At right side of the keyboard there are shortcut keys. They are are used by right fingers.
Excel does not have any shortcut keys for aligning text. See related links for all shortcut keys for Excel 2007.
DAL
The action assigned to shortcut keys can be different in different applications. In the case of Microsoft Excel, Ctrl+1 is a useful shortcut to the format dialog, where you can assign cell formats, borders, etc.
Ctrl+s
Shortcut Keys
Key Tips
Ctrl+E
Underline
ctrl + e
Ctrl - L
A list of Windows shortcut keys can be found online on the Microsoft Windows website. To be sure that the list of short cuts is relevant to your PC, be sure you have the list that pertains to the version(XP, 7, 8) of Windows you are using.