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I really am not sure what this means, but apparently one term refers to holding the yarn in the opposite hand from the hand wielding the knitting needle and the other term refers to holding the yarn in the same hand.
In crochet, you will have to adjust to holding the yarn in the opposite hand from the one holding and wielding the hook. There are a number of ways to hold the yarn (see tip), but I have discovered that this is probably one of the most challenging parts of learning to crochet for knitters.