How do I get rid of stitches that I’ve managed to gain during my knitting?
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You can do decreases here and there, see the Decreases page.
It would be better to figure out why or how you’re gaining sts and avoid doing so. Read the stickied thread on the common ways of getting extras.
Are you getting extra stitches by accident? Make sure you are not creating stitches by bringing yarn over the needles instead f BETWEEN the needles when switching from knit to purl.