Disclaimer : I just copied those shortcuts from
Jupyter Menú >
Keyboard Shortcuts, I didn't wrote them myself.
Check your current shortcuts in your Help, shortcuts coule have been modified by extensions or your past self.
The IPython Notebook has two different keyboard input modes. Edit mode allows you to type code/text into a cell and is indicated by a green cell border. Command mode binds the keyboard to notebook level actions and is indicated by a grey cell border.