Stockinette stitch is also called: plain knit, jersey. This pattern is most often used in knitting. It's easy to do.
Row 1: all knits;
Row 2: all purls.
Then we repeat this pattern from row 1.
We continue our work in this way: the right side (odd) rows consist of the knit stitches; wrong side (even) rows consist of the purl stitches. If we knit in the round, we must knit all stitches. This pattern may be knitted by both the first and second method. However keep in mind to need to follow the chosen method, for example: we shouldn't make the knit stitches by the first method, but the purl stitches by the second method. Some more details about knitting stitches: knit and purl stitches.
Jersey fabric (in contrast to, for example, relief patterns) can be blocking using steam and electric iron, but you must follow the instructions for the fibrous structure of the yarn and recommendations for care.
In Section Knitting Stitch Patterns
In Section Crochet Stitch Patterns