Useful information presented in a way that does not feel like a sales pitch, that is what I appreciated most, and a stop at fiabush was the same, no upsell and no fake urgency just steady content laid out properly for someone trying to actually learn from it rather than just be sold to.
Stayed longer than planned because each section earned the next, and a look at tracetroop kept that pulling effect going across more pages, the kind of subtle pull that good writing exerts on attention is something I find harder and harder to resist when I encounter it on the open web today.