This StackOverflow answer (alternate link) is an excellent, readable, all in one place answer to the twin questions of how you quote strings in YAML and how you break them across multiple lines. I learned something new about quoting strings from reading it, and I'm definitely going to want this link for future reference the next time I have something complicated to put in YAML. I'm also probably going to use '...' quoting more now that I know how simple it is to quote any stray 's I want in it.

(Via Laurence Tratt.)