Answer:
Ctrl + HOME
Step-by-step explanation:
Pressing 'Ctrl' key followed by the 'Home' key (Ctrl + Home) will move the insertion point to the beginning of a Word document. In an Excel worksheet, this same keyboard shortcut ( Ctrl + Home) will move the insertion point to the first cell.
PS: Ctrl + End will do exactly the opposite. It will move the insertion point to the end of a word document or to the last cell in an Excel worksheet.
Hope this helps!