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There are two basic kinds of stitches, plain and purl:
ret og vrang in Danish.
'Normal' stocking stitch (glatstrikning) consists of alternate rows of plain and purl.
If you knit two consecutive rows of plain (or two of purl), you get a 'ridge' on the right side, which is often deliberate to stop the knitting curling, to make a pattern or for any number of reasons.
'Garter stitch' means knitting all the rows plain.
US terminology is slightly different: a 'plain' stitch is a 'knit stitch', for instance, but if you need more, just google 'how to knit' and select sites from whichever side of the pond you need.