MS Excel
You can auto fit the width of column by

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

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MS Excel
How do you select an entire column?

Hold down the Ctrl key as you click anywhere in the column
Select Edit > Select > Column from the menu
Hold down the shift key as you click anywhere in the column
Click the column heading letter

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