The single crochet is the shortest and simplest crochet stitch. It creates a tight, dense fabric and is great for amigurumi (stuffed animals), dishcloths, bags, and any project where you want little stretch.
Half double crochet is one of the basic crochet stitches. It’s taller than a single crochet but shorter than a double crochet, making it a great middle-ground stitch for hats, scarves, and bags.
The double crochet is a basic crochet stitch that is about twice as tall as a single crochet stitch. The stitch is perfect for blankets, scarves, hats, and bags as it gives your work a light, open feel.