A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Using a laptop or other 'condensed' keyboard? If so, in order to get the left arrow key to work as the Home key you need to use the fn key as well, so the stroke would be: fn+Cmd+Left Arrow or fn+Ctrl+Left Arrow - either will work.
The Notes at the top of the Help page JE pointed you to clarify the point that keystroke combinations may vary depending on style of keyboard.
Regards,
Bob J.