Mistake: Further vs Farther

farther = distance; further = more/extra.

Examples

• Go no farther.
• Further details.

Key rules

• Farther refers to physical distance: go no farther
• Further refers to extra or more abstract amounts: further details
• In British English, further is used in both senses

Common mistakes

• Go no further, a long way → Go no farther (physical distance)
• Farther information → Further information

Use cases

• Giving directions
• Asking for information
• Writing business emails