It is long form text, which is an automatic -1 for me, and I dismissed this for a while, but over time it's seemed to come out as one of those "great" resources in a different domain that I muse read. After starting, I noticed
1. It reads more like vimtutor than an article; i.e. you pick your own adventure, which I can bite
2. Many people I look up to as experts have directly recommended this to me
3. It's relevant to me now - I'm working on a startup
I still dismissed the guide for a long time and wasn't convinced it was the best resource out there - but it's starting to seem like it's atleast a local maxima for me.
I hope that made sense into how I think about resources when learning. I don't yet have a coherent system in place to determine how valuable a resource is to me. I usually only know months or years later
I use HN to find the best programming and math resources by using their search function, looking at the most upvoted learning resources or by scouring the comments and finding a consensus in a more qualitative manner.
On the top of my head: it led me to places such as Gilbert Strang for linear algebra or Eloquent JavaScript for a good introductory textbook and JavaScript The Good Parts for a more advanced textbook. 3Blue1Brown was a good channel for mathematics. And it is also thanks to HN that I discovered vimtutor. There are also a lot of references made her to Coursera course Learning how to Learn.