Knitting (or purling) two stitches together is the easiest technique and one that every beginner must learn. This basic decrease slants to the right on the knit side of the work. It is abbreviated k2tog (or p2tog).
Insert the right needle from front to back (knitwise) into the next two stitches on the left needle. Wrap the yarn around the right needle (as when knitting) and pull it through. You have decreased one stitch.