Learn how to work a back post double crochet stitch (BPdc) with this video tutorial. The same way you can make any other stitch to get back post single crochet (BPsc), back post treble crochet (BPtrc), back post double treble crochet (BPdtrc) etc. ... for this insert the hook not through the stitch on row below but around the post of the stitch from back to front. Thanks for watching!
Steel Crochet Hook size 2mm or 2.25mm (#4 or #2 US standards) and yarn: 55% Cotton, 45% Polyacrylic, 160m in 50g, 5 ply.