Usually, this means knitting two stitches, then passing the first stitch over the second, repeating for the number of stitches required.
Insert your needle into the edge of the sweater (often in the gap between stitches), wrap the yarn, and pull it through to create a new stitch. bost up
To join, take the last stitch you worked (the edging stitch) and pass it over the newly picked-up stitch to securely connect a new section (like a border or sleeve) to the main piece. Usually, this means knitting two stitches, then passing