When making a crochet stitch, you end up with two loops at the top of the stitch, a front loop towards you and a back loop. When asked to crochet BLO you make the same stitch but leave one loop untouched.
When making a crochet stitch, you end up with two loops at the top of the stitch, a front loop towards you and a back loop. When asked to crochet BLO you make the same stitch but leave one loop untouched.