When you increase stitches you are adding an extra stitch (or loop) to your needle. This will increase the length of your row by 1 stitch, thus increasing the width.
When you decrease stitches you are removing a stitch (or loop) from your needle. This will shrink the length of your row by 1 stitch, thus decreasing the width.
For more knitting lessons check out this guide.
Step 1: Increase Stitches
- Knit a stitch, but don't slip the stitch off your left needle
- Instead, bring your right needle through the top stitch on your left needle, and knit another stitch.
- Now remove the stitch from the left needle
Step 2: Increase: Yarn Over
- Knit a stitch
- Wrap yarn once around right needle to make an extra loop on right needle.
- Continue knitting
Step 4: Decrease: KRPR
- Knit one stitch
- Return stitch you just knitted back on to the left needle
- Take the second stitch on left needle using your right needle and pass it over the top stitch on the left needle and off the needle.
- Return top stitch on left needle back to right needle.