BO, or bind(ing) off, is used to remove your project from the needles you've been knitting with.
These steps will help you keep the integrity of knit stitches, meaning you will follow those Knit stitches in the bind off process. The most important thing to remember is yarn placement. For Knitwise, your yarn must stay behind your work, in order to allow you to Knit a stitch as well as to BO a stitch.
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