Vietnamese-native, not translated. Every topic is rewritten with local metaphors — chợ, phở, Grab, Shopee, MoMo, Techcombank, VinBrain — so concepts land intuitively instead of feeling like a foreign textbook in costume.
Visual-first, not text-first. 47 interactive primitives (sliders, drag-and-drop, toggle-compare, match-pairs, animated SVG) carry the explanation. Walls of text are the exception, not the rule. You play with a concept before you read about it.
