Starting chains can be pretty annoying when you want a straight edge. They can really take away from the look of a scarf or blanket that doesn’t have any edging around it. Luckily, you can get rid of them with this variation of a double crochet stitch. Now you can get the height and the first stitch all in one.
You can hover over the images to get a left-handed view.
To start, draw up the starting loop to the height of a dc.

Holding the loop still with your finger, yarn over with the loop. You now have three loops on the hook.

Yarn over, pull through two loops. You now have two loops on the hook.

Yarn over, pull through remaining two loops.

Now you can skip the first dc (you already made it) and continue normally unless the chain counts as a dc in your pattern.
If you need any help, feel free to ask questions in the comment section.