Technique used to close invisibly. The toe of a sock you are knitting from the cuff down or the heel of a sock you are knitting toe up.
Make sure there is an equal number of stitches on each needle (e.g., 12 sts on each needle).
Work 2 stitches from needle 1 before moving to needle 2, and vice versa.
Place your needles parallel to each other.
Your yarn is anchored on the needle furthest from you (needle 2).
Needle 1 (the one closest to you): knit the first stitch and drop it. Knit the second stitch as if to purl and keep it on needle 1.
Needle 2 (the one furthest from you): purl the first stitch and drop it. Purl the second stitch as if to knit and keep it on needle 2.
A little "mantra" to repeat until the process becomes second nature:
Needle 1: knit stitch I drop, purl stitch I keep.
Needle 2: purl stitch I drop, knit stitch I keep.
Repeat the process for needle 1 and needle 2 until there are no stitches left.
Weave in the yarn.
Happy knitting. 🧶

