Reverse single crochet stitch or crab stitch is great for giving a nice finished edge to your crochet pieces. It's crocheted just like a regular single crochet stitch, but instead of working from right to left, crab stitch is worked from left to right, crocheting each stitch in a stitch on the right of the previous stitch.
Insert your hook through the stitch on the right of the previous stitch.
Grab the yarn with your hook and draw up a loop.
Tip! I find it easiest not to yarn over as usual, but to grab the yarn moving the hook down over the yarn.
Yarn over and draw through both loops on the hook.
This creates a nice decorative edge.
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If you have any questions, do not hesitate to contact me or leave a comment below, I am always happy to help.