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Quick, clean, and to the point

Move to left edge of data region

Windows shortcut 
Ctrl
Mac shortcut 

If the active cell is empty, Excel will stop on the first non-empty cell to the left. If the active cell is non-empty, Excel will stop on the last non-empty cell to the left.

On a Mac, the command key (⌘) can be used instead of the control key.

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The videos below demonstrate this shortcut.
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