Cells are the boxes created by the intersection of rows and columns.
The cell with a dark boundary  is called the active cell.
The formula bar is made up of two parts:Name box and Formula box.
The names of the worksheet appears on the sheet tab.The active sheet name is displayed in bold letters.You can move from one sheet to another by clicking at its tab.
Status bar displays current status of the cells and Zoom option.

I am sorry I myself did not know what is column bar and row readings.
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