Crochet 2nd chain from hook refers to the exact starting point for your first single crochet stitch after completing a foundation chain, counted backward from wherever your hook currently sits. I still see beginners miscount this by one chain fairly often, which is worth double-checking carefully. This guide gives a quick reference.

Quick Reference
Your hook sits in the last chain you made, which counts as the first chain. The next chain back toward your slip knot is the second chain from the hook, exactly where your first single crochet stitch begins.
Why the First Chain Gets Skipped
The very first chain acts as a placeholder rather than a working stitch, similar to how a turning chain works at the start of a row, which keeps your stitch count consistent with what your chain was meant to produce.

Frequently asked questions
Does this rule change for taller stitches?
Yes, half double crochet starts in the third chain from the hook, and double crochet starts in the fourth, since taller stitches need a correspondingly taller placeholder chain.
Want the fully detailed explanation?
See worked examples and a troubleshooting section for this exact question.
Read the full guide