Whether you’re an experienced knitter or a beginner just learning the ropes, lifelines—scrap pieces of yarn periodically slipped through every stitch in a row of your project, allowing you to safely rip back your work to that point without dropping any stitches—can be a complete sanity savers, especially if you make a mistake. (Think of it as a kind of knitting insurance policy.) So, how do you know when should you use one? Check out this helpful guide to 7 times you should use a knitting lifeline that my pal Ashely from The Feisty Redhead shared on the Craftsy blog!