Answer:
To
Press
Save
Control+S
Copy
Control+C
Paste
Control+V
Copy formatting
Control+Shift+C
Cut
Control+X
Undo
Control+Z
Redo
Control+Y or
Control+Shift+Z
Bold
Control+B
Italic
Control+I
Underline
Control+U
Select all
Control+A
Find
Control+F
Insert a line break within a cell
Alt+Enter