Fish has a lot of useful keyboard shortcuts that can be used to edit or change the commandline. The shortcuts I find useful are:
Ctrl+c: Clear the command line
Ctrl+l: Clear the terminal screen and show a fresh command prompt
Ctrl+w: Delete the word to the left of the cursor. This is useful for cases where you use Fish to bring back an old command and want to just change the last parameter.
Alt+Right: Move back and forward in directory history. The PWD shown in the prompt autoupdates while you press these keys. Just stop when you have reached the directory you want. This is a killer feature cause it makes switching back and forth between directories so easy!
Tried with: Fish 2.0.0 and Ubuntu 14.04