The vocabulary the exams and the daily work both assume you already have. Every entry gives the definition, the source it is drawn from, and the misreadings that follow from getting it wrong.
42 concepts, page 3 of 3
Value is a guess until a Sprint tests it. The Increment is the evidence, and a forecast is not a commitment.
Scrum
Interviews with people who recently evaluated the product, whether they bought or not, to find out what they compared, what decided them and what they were actually trying to solve.
Discovery