Tunisian simple stitch
The forward pass gathers loops under vertical bars; the return pass closes them.
Counted practice swatch
Chain 15. First forward pass: leave the working loop on hook and draw up one loop in each following chain (15 loops).
Work the repeat
Return: yarn over through one loop, then yarn over through two repeatedly until one remains. Later forward passes: skip the first edge bar; insert under each front vertical bar and pull up a loop; at the last edge enter both edge loops. Finish with 15 loops and repeat the return pass.
Read the fabric
The loop already on the hook is stitch 1. Counting it again at the first bar makes an unwanted increase. Add an edging or block the sample to manage curl.