I've been reading Adam Hamilton's Zeal Essays almost from the beginning of this fine site.
The charts can be a struggle in the beginning for anyone not using mathematics, or charting on a daily basis.
But, Zeal consistently offers clear language in explaining both their ideas and their charts.
Clicking on the chart will take you to the essay from which it was taken.
Clicking on this here set of gears will take you to Zeal's index.