Knowledge is a fundamental aspect of human understanding, evolving through different dimensions and perspectives. The nature of knowledge varies depending on its scope, application, and contextual relevance. In this lecture, we explore four key distinctions in knowledge: Particular vs. Universal, Concrete vs. Abstract, Practical vs. Theoretical, and Textual vs. Contextual. Each of these dichotomies helps us comprehend how knowledge is categorized, interpreted, and applied across different fields of study.