Important Keyboard Shortcut in Windows You Must Know below is just my opinion, but if you think there are something missing maybe I can add it later

1. View desktop

+ D

2. Run Tasks

 + R

3. Copy Files or Directory

CTRL + C

4. Paste Files or Directory

CTRL + V

5. Save Files

CTRL + S

6. Cut Files

CTRL + X

7. Undo Files

CTRL + Z

8. Close any Active WIndow

ALT + F4

9. Maximize Browser Size

CTRL and +

10. Minimize Browser Size

CTRL and -

11. Choose Working Window

ALT + TAB

12. Lock Windows screen

+ L

13. Task maneger 

CTRL + ALT + DEL

14.selecting word with keyboard

shft + Arrow key