1. Ctrl + A: Select the entire worksheet
2. Ctrl + B: Bold selected text or cells
3. Ctrl + C: Copy selected text or cells
4. Ctrl + D: Fill down from the selected cell
5. Ctrl + F: Open the Find and Replace dialog box
6. Ctrl + G: Go to a specific cell or range in the worksheet
7. Ctrl + H: Open the Find and Replace dialog box with the Replace tab selected
8. Ctrl + I: Italicize selected text or cells
9. Ctrl + K: Insert a hyperlink
10. Ctrl + N: Open a new workbook
11. Ctrl + O: Open an existing workbook
12. Ctrl + P: Open the Print dialog box
13. Ctrl + R: Fill to the right from the selected cell
14. Ctrl + S: Save the active workbook
15. Ctrl + U: Underline selected text or cells
16. Ctrl + V: Paste the contents of the Clipboard
17. Ctrl + W: Close the active workbook
18. Ctrl + X: Cut the selected text or cells
19. Ctrl + Y: Repeat the last action
20. Ctrl + Z: Undo the last action
21. F2: Edit the active cell
22. F4: Repeat the last action
23. Shift + F3: Open the Excel Formula Builder