That's the keybindings to use. For example when emacs mode is selected, you can use C-a to jump to home or C-e to jump to the end of the line. If it is changed

That's the keybindings to use. For example when emacs mode is selected, you can use C-a to jump to home or C-e to jump to the end of the line. If it is changed to Vi mode then you can hit escape to go to normal mode and then use '0' to jump home or '$' to jump to the end etc.