This document provides an overview of how to change the appearance of worksheets in Excel, including modifying column widths and row heights, inserting and deleting columns/rows/cells, hiding and unhiding rows and columns, setting vertical text alignment and rotating text, finding and replacing data and formatting, utilizing AutoCorrect, searching Help, and using Excel's proofing tools like Spell Check, Research, Thesaurus, and Translation. The lesson objectives are to learn how to perform these appearance-changing tasks and effectively use Excel's tools.