Slip stitch (sl st or ss)
This is the shortest of all crochet stitches. Unlike other stitches, slip stitches are not usually used on their own to produce a fabric. The slip stitch is used for joining, shaping and, where necessary, to move the yarn to another part of the fabric for the next stage
1. Insert your hook into the 2nd chain from the hook, wrap the yarn over the hook and draw the yarn through the chain and the loop on the hook in one movement - 1 sl st is made.
2,Repeat this step with the next loop of chain.