1- Studies in the Principles of Religious Sciences (Interpretation and Other Qur’an-related Sciences, Prophetic Tradition Sciences, Philosophy and Islamic Theology, and Methodology of Islamic Call (Da'wa)

2- Studies in the Islamic jurisprudence (General, Comparative, and History of Authenticated Rules of Islamic jurisprudence

3- Studies in Classic Arabic (Linguistics, Rhetoric, Literary Theory & Criticism, Philology, and Literature)

4- Studies in the European Languages (Linguistics, Literature, and Translation Theories in English)