MS Excel
You can auto fit the width of column by

Double clicking on the column left border of column header
Double clicking on the column name on column header
Double clicking on column right border on column header
Double click on the cell pointer in worksheet

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MS Excel
How do you insert a row?

Select the row heading where you want to insert the new row and click the Insert Row button on the standard toolbar
All of the listed here
Right-click the row heading where you want to insert the new row and select Insert from the shortcut menu
Select the row heading where you want to insert the new row and select Edit >Row from the menu

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