I'm usually one of those "JS frontend ecosystem is too complex" guys, but I found this tutorial to be quite approachable. Maybe the format of introducing one thing in each section helps?

There was a similar but much more complicated tutorial on HN a while back that I didn't get at all. Most of the explanation was handwavy - "just do this, trust me" - and the entire tutorial was dumped on a single page. Just looking at the scrollbar discouraged me!

I'm kind of surprised to see Yarn in a tutorial already. Welcome to the fast-moving world of JS, I guess?