It changes to Edit mode.
In Excel, it means entering something in a cell.
A formula.
In Microsoft Excel, pressing the Escape/Esc key while typing in an active cell will cancel the entry.
label
Right-aligned
This question is not clear. There is no Excel process for "finalizing" a cell. When you are done making changes to a cell, just click to another cell.
Z is not a number.
cell contents
To cancel an entire entry before entering it into an Excel cell, hit the Esc key or click on the Cancel button on the formula bar, which is the red x.
lavel
As you type, Excel displays the entry in the FORMULA BAR, and also displays the active cell reference int he Name box on the left.
In Excel, you can set validation rules on a cell to ensure the data meets specified conditions before Excel will accept the entry.