List all CLTR function on the keyboard
1. CTRL + A: Select all
2. CTRL + C: Copy
3. CTRL + V: Paste
4. CTRL + X: Cut
5. CTRL + Z: Undo
6. CTRL + Y: Redo
7. CTRL + F: Find
8. CTRL + S: Save
9. CTRL + P: Print
10. CTRL + B: Bold
11. CTRL + I: Italic
12. CTRL + U: Underline
13. CTRL + N: New (open a new document or window)
14. CTRL + O: Open (open an existing document)
15. CTRL + W: Close current window/tab
16. CTRL + T: Open a new tab in a web browser
17. CTRL + R: Refresh the current page in a web browser
18. CTRL + D: Bookmark the current page in a web browser
19. CTRL + H: Open browsing history
20. CTRL + L: Select the URL bar in a web browser.