Have you ever wondered about the difference between these two words?
Both further and farther refer to distance. Further is more commonly used in a figurative sense, whereas farther is used in a more literal sense to refer to an actual distance.
The farther they went from the town, the denser the woods became.
The thief stole whenever he could to further his own ends.
Farther and farther they travelled, until ‘home’ was but blip on the distant horizon.
‘Further to this, I have nothing more to say.’