MS Excel
You can activate a cell by

Clicking the cell
Pressing the Tab key
All of these
Pressing an arrow key

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MS Excel
How do you delete a column?

Select the row heading you want to delete and select Edit>Delete from the menu
Select the column heading you want to delete and select Insert Delete from the menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Right click the column heading you want to delete and select delete from the shortcut menu

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