This method has probably been around for as long as crochet. No one clued me in so it was something I had to learn for myself. For some of you this is probably ancient news but for those just starting out, I hope this is a help.
Left is the front of the starting chain. Right is the back of the starting chain. You will be working into the back of the chain.
The hook is inserted into the loop that sits on the back centre of the chain. The loop may be more or less raised depending on your tension. For the purposes of the pictorial, I kept my tension slack.
See the lovely plaited/braided loops running down each side of the work?
This is a great foundation for a border. Because it looks like a finished edge, you could go borderless. 😀