If you simply need to perform a calculation, you can use the Formula bar as a calculator.

Formulas can refer to cells in other worksheets-and the worksheets don't even have to be in the same workbook. Excel uses a special type of notation to handle these types of references.

You can enter nonrelative references (absolute or mixed) manually by inserting dollar signs in the appropriate positions, or you can use a handy shortcut - F4 key.

You can use "Copy" (Ctrl+C) and "Paste" (Ctrl+V) options, but there is a faster way to "copy" a formula to multiple adjacent cells.

If you have lengthy text in a cell, you can force Excel to display it in multiple lines within the cell.