How to Crochet Star Puff Stitch Bookmark for beginners – step-by-step video tutorial. For crochet beginner's, it will introduce the weave of simple basic: a foundation chain, half double crochet (hdc), long double crochet and shell stitches. A Puff stitch. To crochet a puff stitch, you half-close several stitches worked in the same stitch and then join them together to finish the stitch. Shell stitch. This is an adaptable stitch with many variations. To make a shell stitch, work 2 half double crochet stitches in the same stitch.