I found this SO difficult when I first learned to crochet. I know some crochet into both sides of the “V”, but personally I’ve found this (the way I’ve demonstrated in the video) to be the least painful way of crocheting into the foundation chain, and doesn’t leave you with a super tight chain.
If you’re finding this part tricky, don’t despair! The beginning of the project is always the most frustrating, and once you’re a few rows in it’s smooth sailing.