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