I see a lot of love for her later, more complex work, but 'Walker Brothers Cowboy' from her first collection is where it all began for me. It's a simple story of a Depression-era salesman father taking his two kids on an unexpected detour to visit a woman from his past. The narrator, the young daughter, only half-understands the tense, nostalgic adult world she's witnessing.
That child's perspective, noticing everything but comprehending only the emotional weather, is so perfectly rendered. You feel the heat, the dust, the awkwardness, and the unspoken history. It establishes Munro's core landscape and her method of revealing adult complexities through the eyes of characters on the periphery. It's a beautiful, gentle, and deeply suggestive starting point.