MS Excel
A circular reference is

A formula that either directly or indirectly depends on itself
Geometric modeling tool
A cell that points to a drawing object
Always erroneous

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MS Excel
The autofill feature

Automatically adds range of cell values
Extends a sequential series of data
Applies a boarder around the selected cells
All of the listed here

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MS Excel
You can auto fit the width of column by

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

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