CABLE CAST-ON METHOD
Use it for a firm edge, and when adding stitches to your work
Make a slip knot. Insert right-hand needle into the stitch as if to knit. Wrap the yarn around the point and pull through, slipping the stitch on to the left-hand needle.
Push the point of the right‑hand needle between the first and second stitches. Wrap the yarn anti‑clockwise around the point of the right‑hand needle.
Pull the loop out with the right‑hand needle, then slip it over the tip of the left‑hand needle.