The Knit Stitch
Above: Wrapping the yarn for tension. Tension is essential to having control and building speed. For additional tension, wrap the yarn around the left pinky. Finding the right system for you starts with something like this and evolves as you practice.
Above: The position of the needles as the working yarn is picked through the stitch on the left needle. Notice how the needle bosses that stitch around so you can see the working yarn to pick it through.
Above: The working yarn comes through the existing stitch to form a new stitch on the right needle.
The Purl Stitch:
Above: Purling with the yarn in the left hand. Notice that the yarn must be completely in front of the whole set-up.
Above: The yarn must come from the front of the right needle around to the back of the right needle so that it is between the needles before being scooped out the back of the existing stitch.
The Norwegian Purl:
Above: The working yarn is behind the needles-in the same position as for the knit stitch. The right needle comes in behind the yarn and into the stitch purlwise.
Above: The right needle "scissors" around to the back of the work.
Above: The right needle picks up a stitch from over the working yarn, just as for a knit stitch.
Above: The right needle "scissors" around to the front of the work, rotates counter clockwise, dips below all strands...
And Voila! The stitch almost forms itself before you realize it. Try it!