1.1. Format Worksheets and Workbooks
1.1.1. Changing worksheet tab color
1.1.2. Modifying page setup
1.1.3. Inserting and deleting columns and rows
1.1.4. Changing workbook themes
1.1.5. Adjusting row height and column width
1.1.6. Inserting watermarks
1.1.7. Inserting headers and footers
1.1.8. Setting data validation