Cast on: Start stitches. This is your first stitches of your yarn.
Cast off (Bind off): Finish stitches. This is your last stitches of your yarn.
Circular Needles: One of knitting needles is a pair of short straight bent needles with a flexible cord. When you knit the round, you need circular needles.
Knitting in the Round (circular knitting): Knitting with circular needles to create tubular items such as socks or hats.
Pattern: A set of directions to knit
Stitch (Plain stitch): basic knitting stitch
Purl stitch: A knitting stitch made by doing a plain stitch backwards
Ribbing stitch: A combination of knit and purl stitches. The ribbing stitch creates a stretchy fabric. It is a very useful stitch for beginners.