EDIT: now that I think of it, Ctrl-R is really the killer app of bash/readline and it's saved me many more keystrokes than the word/line delete or cursor motion keys.
Except for the password rules. It took me three tries to comply, because it only displayed one violation at a time. Besides, do I really need a strong password for a site like this?
I bookmarked it. Please keep adding to it. You could make it the best bash cheat sheet on the web, if you steal from all the other ones out there. It needs a lot more shortcuts.
https://thimbleprojects.org/smlefevre/102167/
Bash cheat sheet-- keyboard shortcuts for jumping and deleting words