How to Do knit-one-purl-one bind-off
This video demonstrates how to do a basic knit-one-purl-one bind-off. This is a bind off for knit 1 purl 1 ribbing. Knit-One Purl-One Bind-Off
A very nice BO for ribbing
This is a bind-off for K1 P1 ribbing.
If you're familiar with the kitchener stitch, you may prefer to work this BO in this way: Transfer all of the knit stitches to one needle, and behind this needle, place all the purl stitches on a second needle. Sew the stitches from the two needles together, as for the kitchener stitch.