People don't buy products, they 'hire' them to make progress in a specific situation, the famous milkshake was hired to make a boring commute bearable, not because it was tasty. Find the job, and you understand why people switch, what they compare you to, and what would make them fire you.
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The primary-source telling of the milkshake story, the single most memorable illustration of Jobs to Be Done, straight from Christensen and HBS. The best on-ramp to JTBD.
The canonical HBR article that formalizes JTBD from its originators, the authoritative reference every founder citing 'jobs to be done' should have actually read.