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When you look at the top edge of the last row you crocheted, you should see what look like chain stitches laying on that top edge. Unless the pattern indicates otherwise, you should be inserting your hook through both loops of that chain stitch when crocheting. But, sometimes, a pattern will instruct you to crochet into "back loops only" (BLO -- insert hook into only the loop of the chain stitch that is on the back side of the item that is facing you) or "front loops only" (FLO -- insert hook only into the loop that is nearest to you, on the front side). Using one of these techniques gives a very different look to your work and results in a stretchier fabric.