Bulky Crochet blanket - thinking this will be a nice winter time project. Per another pinner's comments: Rows of half-double crochet done in the back loops only, using bulky (weight class or super-bulky (weight class yarn with a P or even Q size hook.
Post stitches are fun stitches that add lots of texture to your project. When you need to decrease, here are photo and video tutorials for both the front post double crochet (fpdc) decrease and the back post double crochet (bpdc) decrease.
Half Double Crochet: Tutorial & Tips You Need to Know