Question: how to do fhdc crochet stitch?
Answer: Start with 3 chains on hook.
Yarn over, and then insert hook into the first chain/3rd chain from hook. ... 
Yarn over and pull up through the first loop on the hook <- this creates your first “chain stitch”.
Yarn over and pull through all 3 loops on hook <- this completes your first foundation half double crochet stitch!