Half Double Crochet into Through Back Loops (tbl)

How to crochet the Half Double Crochet through Back Loops (tbl) Only (BLO) for the Crochet Slouchy Triangle Hat & other beanie patterns

https://www.designsbyphanessa.com/

Most of my patterns including the Triangle Slouchy Hat uses this method of creating the brim.

Etsy: https://www.etsy.com/shop/designsByPhanessa
Ravelry: http://www.ravelry.com/designers/phanessa-fong
Craftsy: https://www.craftsy.com/profile/designs-by-phanessa