If you want to paste text in your worksheet, you can use Excel's Convert Text to Columns Wizard.

Excel's ability to create automatic subtotals is a handy feature that can save you a great deal of time.

Creation of a large number of visually consistent charts to represent different data is a time consuming and error prone task, unless you know how to copy formatting between charts. Also Excel 2007 introduced a new ability to create chart templates.

This tip describes how to use conditional formatting for comfortable viewing results in the worksheet.

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

If you are working with huge workbooks that contain a very large number of formulas, functions, and data, you can turn off the automatic recalculation.

Sometimes you might want to lock cells in your Excel spreadsheet that contain formulas and functions or data. Thus, the person doing the data entry will not accidentally overwrite or delete the spreadsheet formulas and functions or your data.

Much like as you can protect elements of each Excel spreadsheet (see Protecting spreadsheet elements for more details), you can protect structure of the sheets in the workbook, prohibiting renaming, moving and other operations.

With Excel built-in tools you can easily work together on workbooks and monitor who, when and what changes made. E.g., track project status and tasks.

Working with large and complex Excel workbooks, especially when entering large amounts of data, no one is protected from accidental changes in formulas, formats and other spreadsheet elements. But you can protect yourself from too much work on finding and eliminating such errors by protecting the individual spreadsheet elements.