bo = bind off
Binding off or casting off means to take your knitting off your needles as a finished work or even for a few stitches within a pattern (it could be for a buttonhole or small opening). Below is a simple/ basic bind off. It consists of knitting the first two stitches and then taking the first stitch on the right needle up ond over the second stitch to come off the needle tip. That results in the first bind off. To continue, simply knit the next stitch on the left needle and repeat the same process as before on the right needle. See the following video for a tutorial.
Beginner Needle Knit Series overview http://youtu.be/TkaSfY8NfdY
How to Knit – Cast On Beginner (with closed captions) http://youtu.be/nWJQvsZ6kT0
How to Knit – Knit Stitch Beginner (with closed captions) http://youtu.be/x4kSztvq-vI
How to Knit – Purl Stitch Beginner (with closed captions) http://youtu.be/lkb0YyrzPWA
How to Knit – Bind Off Beginner or cast off http://youtu.be/TMAUORm-GK4
How to Check Knitting Gauge or measure gauge http://youtu.be/HCjapH8LO_I