One way to decrease a stitch in knitting is by doing a K2tog on the knit row/round or a P2tog on a purl row/round. K2tog stands for knit two stitches together and P2tog stands for purl two stitches together. The videos below show both ways of decreasing one stitch in right handed knitting.

K2tog:

• Insert the right needle from back to front of the second stitch on the left knitting needle and then insert it into the first stitch on the left needle
• Wrap the working yarn around the inserted right needle
• Pull the right knitting needle and working yarn loop into and through the 2 stitches on the left needle
• Keep the working yarn loop (the new stitch) on the right needle and slide the 2 stitches off the left needle

P2tog:

• Insert right needle front to back into the first two stitches on the left knitting needle
• Wrap the working yarn around the right needle
• Pull the working yarn loop on the right needle through the two stitches on the left needle and keep the loop (new stitch) on the right needle
• Slide the first two stitches off the left needle