MS Excel
You can auto fit the width of column by

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

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MS Excel
Right clicking something in Excel:

Selects the object
Deletes the object
Opens a shortcut menu listing everything you can do to the object
Nothing the right mouse button is there for left handed people

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