Foundation dc

Chain 3.
Yarn over,
insert hook in 3rd chain from hook,
yarn over and pull up loop (3 loops on hook),
yarn over and draw through 1 loop (1 chain made),
[yarn over and draw through 2 loops] 2 times (Figure 1)— foundation double crochet.

Yarn over, insert hook under 2 loops of chain at bottom of stitch just made,
yarn over and pull up loop (3 loops on hook) (Figure 2),
yarn over and draw through 1 loop (1 chain made),
[yarn over and draw through 2 loops] 2 times (Figure 3).

*Yarn over, insert hook under 2 loops of chain at bottom of stitch just made (Figure 4),
yarn over and pull up loop (3 loops on hook),
yarn over and draw through 1 loop (1 chain made),
[yarn over and draw through 2 loops] 2 times.
Repeat from * as needed (Figure 5).