[sixo]

The genre of this article is not pedagogical, really. One usually learns these techniques in the course of a particular field like physics, electrical engineering, or theoretical chemistry. This article is best thought of as "a story you've seen before, but told from the beginning / ground up, with a lot of the connections to other topics and examples laid out for you". For that purpose, it's excellent, perhaps the best I've ever seen. It might also whet the appetite of a novice, but it's not really for that.