Product Management Job Knowledge refers to an organized set of principles and facts applying to the general PM domain.
Software Development Methodologies - Frameworks that define the process and practices used to develop software such as waterfall, agile, scrum, lean, and defect management.
Product development life cycle - Understands core components to create and maintain a product roadmap from ideation through launch and continuous improvement; defining a problem and business requirements, describing value propositions, and creating a go-live plan.
Research Methodologies - Controlled studies to gain product or market insights through anecdotes and case studies, feasibility analyses, surveys, and other mechanisms.
Market knowledge - Understands vendor management, 3rd party software integrations, and go-to-market strategies.