A chainless foundation, such as foundation half double crochet, is an alternative to creating a foundation chain. This technique creates your stitch and chain at the same time. The benefit to this method is that it is often faster, and produces a foundation row that is sized similarly to a regular row. Because this method eliminates the chain altogether, it makes your foundation row and the rest of the rows and stitches in your project more evenly aligned. Another benefit of this technique is that it helps to maintain even tension from the very first stitch to the last.
Here’s how to foundation half double crochet:
Ch 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 all loops on hook—1 foundation half double crochet. *Yarn over, insert hook under the 2 loops of the “chain” stitch of last stitch and pull up loop, yarn over and draw through 1 loop, yarn over and draw through all loops on hook; repeat from * for length of foundation.
You can also find instructions in Crochet Me's glossary for similar techniques including: