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Move active cell left in a selection

Windows shortcut 
ShiftTab
Mac shortcut 
Tab

This shortcut will move the active cell left one cell when there are multiple cells selected.

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Tip: How to create a running total in a Table
Calculating a running total in an Excel table is a little tricky, because it's not obvious how to build the formula with structured references. You can easily get the current row with the @ notation, but what about the first row in a column? You might be surprised that you can use INDEX for this.