K2TOG Knit two stitches together to give a right-leaning decrease

Insert the point of the right-hand needle through the loops of the next two stitches as if to knit.

Wind the yarn around the tip of the right-hand needle and pull the yarn through the two stitches, knitting them both together.

Drop the two stitches from the left-hand needle and keep the new stitch on the right-hand needle.

Knitting two stitches together decreases your stitch count by one, and the decrease stitch leans to the right. This is how a series looks.