The knit cast-on makes a elegant elastic edge. Its good for many projects including sweaters, hats, scarves, and socks. You can cast-on an unlimited amount of stitches, and unlike the long tail cast-on, it uses a single strand of yarn, so no need for measuring the cast-on length. This is also a great way to add stitches to the beginning of a row or to cast-on in the middle of a row, if for example, you need to make a neckline. Beginners can learn this method quickly, and it is one of the easiest methods of casting on.