Slip stitch is an important move in your crochet skills. It’s really easy to learn and you will use it loads.
Insert the hook from front to back under the top of the second chain from the hook. Wrap the yarn round the hook (know as yrh).
Pull the yarn through both loops on the hook to make a slip stitch. To carry on working a row of slip stitch, insert the hook into the next chain down and so on, repeating step 2 each time.