Single crochet is abbreviated in patterns as sc, and in the UK the stitch is called double crochet. It's a building block stitch that you can use in so many ways, and it's often combined with other stitches. On its own, single crochet is common for making stuffed toys like amigurumi or play balls. But you can also use this stitch to make blankets, accessories, and more. When crocheting, you should insert the hook under both loops of the stitch from the row beneath. However, you can insert the hook into either the front or back loop only for a very different appearance.
Crochet that is exclusively done in single crochet is usually solid and dense. That makes it perfect for bags and toys where you don't want items to fall out or stuffing to show. This stitch looks different from the front and back, so working back and forth and working in rounds produce two looks. Because this is a tight stitch, it sometimes twists. You can avoid this by using a larger hook, but even if it twists as you start, blocking your work usually removes any twisting.
How to Work Single Crochet Stitch
If you're working on a starting chain, insert the hook into the second chain from the hook. On regular rows of crochet, insert the hook through the V-shaped stitch from the previous row.
Wrap the yarn over the hook, then draw the yarn through the chain or stitch. You should have two loops on your hook. Wrap the yarn over the hook, then draw the yarn through both loops on the hook. You should have one loop left on your hook, and your first single crochet is finished. Repeat the process, which, when shortened, goes like this: insert hook, yarn over, draw up a loop, yarn over, draw through both loops. As you add rows of this stitch, work one chain stitch as a turning chain. A single chain is the same height as a single crochet stitch.