The Slip Stitch is used quite frequently because it is the most effective way to join work together, carry yarn to a different area, fasten stitches and reinforce edges without adding any height to your project. Its very simple and fast to do.
What you will need: Any type of yarn and hook will work for this practice.
Instructions: Start by chaining about 12 stitches.
Put your hook through the 2nd chain from your hook.
Wrap your yarn over the hook.
Pull the yarn through the chain loop and the loop on your hook.
As you can see, a Slip Stitch gives the illusion of skipping stitches without adding any height. This comes in handy throughout a variety of projects and is definitely worth using.