As a newish writer I was previously under the impression that it was up to me to summon the magic completely from thin air. This is fine and dandy when you have a story idea in mind, but insurmountably depressing when you do not. So back then, I would sit at the keyboard and hope. Hope does not float. Hope sinks.
It turns out that writing prompts are commonly used within story writing circles, and having a place to start has been, for me, transformative. I've written shape shifters, stories that begin at the end, and the color red. I've written an old tale in a new way and even a love story. Best of all, the prompts have really helped me to be able to sit down and write, which is way more fun than sitting down and not writing.