How to Make a Slip Knot in Crocheting: A tutorial on making a slip knot in crochet that is very useful to know when learning crochet. We also have step by step photos so you can see the exact process of how to make a slip knot for crochet. Knowing how to do a slip knot in crochet is the first step in learning how to crochet. It's used to begin a crochet project. It is basically the foundation to begin working with the yarn, and the rest of the stitches are built around this foundation.