In a windows PC,the shortcut key for redoing the last action in Microsoft PowerPoint is:

1. ✅Ctrl + Y (or Ctrl + Shift + Z in some applications)
   This shortcut reverses the last undo, restoring the previously undone action. Commonly used in:
   • Microsoft Office Suite
   • Google Docs / Sheets / Slides
   • Design software like Photoshop, Illustrator.
2. ✅ CTRL + T used 
   •   In Web Browsers  Opens a new tab
   •  in Microsoft Word  Opens the Font dialog box (for advanced text settings)
   •  in PowerPoint  Opens Font dialog box (like in Word)
3. ✅Ctrl + E: This shortcut centers the text. 
4. ✅Ctrl+K is a keyboard shortcut used in many applications, primarily for inserting or editing hyperlinks.
5. ✅Ctrl+Shift+Up Arrow selects the text from the current cursor position up to the beginning of the current paragraph.
6. ✅Ctrl+Shift+Left Arrow is a keyboard shortcut that extends the text selection to the left, specifically by one word at a time
7. ✅Alt + Ctrl + Left Arrow typically rotates the display 90 degrees to the left.
8. ✅Shift key + Use mouse shortcut key to select text in MS Word   
9. ✅Ctrl + U Shortcut key to  underline the selected text
10. ✅Alt+L to quickly focus on the address bar, enabling you to enter a new website or search term efficiently. 
11. ✅Ctrl + L: This combination aligns the selected text or paragraph to the left margin. 
12. ✅Ctrl + R: This shortcut aligns text to the right. 
13. ✅Ctrl+N :Shortcut key for blank Presentation in MS PowerPoint
14. ✅Ctrl + J: This shortcut justifies the text, aligning it evenly on both left and right margins. 
15. ✅Ctrl + Y (or Cmd + Y on Mac) shortcut key is used to Redo the last action in a document .
16. ✅Ctrl+Z shortcut key is used to Undo the last action in a document .
17. ✅100 times undo level can be used in a worksheet
18. ✅Ctrl + Shift + D Shortcut key to double underline the selected text  
19. ✅ Ctrl+5 shortcut key are used to strike through highlighted selection in excel 
20. ✅CTRL + I is a keyboard shortcut used to italicize the selected text in most applications like:
    • Microsoft Word
    • Google Docs
    • PowerPoint
    • Excel (for cell text)
    • Web browsers (e.g., Gmail, Outlook web).
21. ✅ Ctrl+5 shortcut key are used to Word / WordPadSets 1.5 line spacing
22. ✅Ctrl + V is a keyboard shortcut used to paste content that has been previously copied or cut.
23. ✅HIGHLIGHT Shortcut Key For PowerPoint : Ctrl + Alt + H,For Word Same as PowerPoint: Ctrl + Alt + H,For Excel Alt + H + H (Fill cell color)

🌐 In Web Browsers (Chrome, Firefox, Edge, etc.):

✅ Ctrl + T → Opens a new browser tab

📝 In Microsoft Word:

✅ Ctrl + T → Creates a hanging indent

📊 In Microsoft Excel:

✅ Ctrl + T → Creates a table from selected cells

✅ Ctrl + Enter Function Word/Docs( Insert a page break), Excel (Fill same value in selected cells (not line break)),
Gmail  (Send Email).