Farther vs. further: What’s the difference?
One relates to physical distance, the other to a state of being or degree.
Think of it this way: If you want to go “far” away, you’re talking distance, and the proper word is “farther.”
A few examples:
This trip took her to Thailand, farther than she’d ever been before.
The farther apart they were, the harder it was to keep in touch.
If you want to go further in your career, you have to be willing to work hard.
The more you hide the truth from yourself, the further you are from getting the truth from others.