How to fix an accidental increase that is an incomplete stitch
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Identify Purl Stitches
The purl stitch looks like a small loop against the needle. Always look at stitches as if you are about to knit them and you will be on the correct side.
How to Rib (english style)
Learning to rib gives you great practice alternating between knit and purl stitches. It is great for keeping a fabric edge flat such as for a hat brim, gloves cuff, or the edge of a scarf or dishcloth.