A selvage stitch is a stitch that is worked when it’s come to, but isn’t part of the pattern design. A selvage stitch is used to keep the edges from unraveling, or just a way to make a neat, consistent edge. It’s used mostly with garter (knit one row, purl the next) or stockingette (knit all) and the two stitches described below create a garter selvage.
A slip stitch is done at the beginning of a row. It just means you skip the stitch. Bring the yarn behind the peg, and work the next peg.
Half Stitch: (hs)
A half stitch is done at the end of a row. Wrap the working yarn around the (last) peg of the row, halfway around. This is like half of an e-wrap. You can half stitch towards the front or back, its personal preference, but the front is looser. I prefer wrapping towards the back, or inside of the loom.