farther
Farther means a greater distance away. You thought you'd be able to hit that can with a rock, but it fell short, so you'll have to try throwing it farther.
further
If you ask your parents for money, they might say they need to think about it further and then ask you lots of questions. Further refers to figurative distance, like a thought you need more time on.
Source. (vocabulary.com)
farther
Farther means a greater distance away. You thought you'd be able to hit that can with a rock, but it fell short, so you'll have to try throwing it farther.
further
If you ask your parents for money, they might say they need to think about it further and then ask you lots of questions. Further refers to figurative distance, like a thought you need more time on.
[Source.](https://www.vocabulary.com/articles/chooseyourwords/farther-further/)
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