I bought Long Story Short: the Only Storytelling Guide You'll Ever Need by Margot Leitman last year, during a writing book buying-spree I went on. Apparently I didn't pay too much attention to it though, becauae it's actually a book about oral storytelling rather than writing. But that was okay - I found Leitman's writing super engaging, and some of her principles do translate to writing stories as well.
Long Story Short is a guide on how to tell true stories from your life to an audience, whether that is during a storytelling competition, as part of your work, or even just to a group of friends. Leitman discovered storytelling by accident when she was an aspiring actress in New York. Since then, she's told her stories on national television, won storytelling competitions, and started teaching others how to tell their true stories. While she covers the basics of crafting a story (specifically looking at things like condensing characters, and making sure your story has a beginning, middle, and end), the majority of the book is focussed on either finding your story, or on giving you the confidence to tell your story (and to tell it truly - don't embellish it!)
Long Story Short is a super quick read (it's also a really cute little book). As I said, I really enjoyed Leitman's writing - you can tell she has a real knack for storytelling! I also liked how it gave great ideas for actually presenting stories - the next time I have to do any sort of presentation, I'll definitely be giving this book another read!