Philosophy aims to search for meanings, truths, and principles through systematic theories about knowledge, truth, existence, causation, and good. It can be studied subjectively based on one's personal beliefs or more systematically through various philosophical approaches and branches. These include ontology concerning reality, epistemology regarding knowledge, and axiology involving theories of value like ethics. As an educational philosophy, idealism sees reality as consisting of ideas and seeks absolute truths, while realism views reality as objective and emphasizes empiricism and character development through practical knowledge.