1. The document discusses analyzing a firm's internal environment to understand its unique resources, capabilities, and core competencies that provide competitive advantages.
2. Core competencies are combinations of resources and capabilities that are valuable, rare, costly to imitate, and non-substitutable. They allow firms to neutralize threats or exploit opportunities.
3. Sustainable competitive advantages result from core competencies that satisfy these criteria and are difficult for competitors to replicate due to causal ambiguity or social complexity.