The GARTER STITCH is simply KNIT EVERY ROW. You can make a lovely scarf with the GARTER STITCH, or a potholder or wash cloth. You can make a shawl, a blanket, just about anything. The photo above, on the left, is a sample of the GARTER STITCH. The VIDEO above demonstrates HOW TO KNIT THE GARTER STITCH.
Here are written instructions on how do the GARTER STITCH.