Religious Fundamentals That Every Muslim Should Know About by Darussalam is a brief treatise based on the work of Sheikh-ul-Islam Muhammad bin Sulaiman At-Tamimi. It explains the concepts of Tauhid (Islamic Monotheism), Shirk (Polytheism) and Nifaq (Hypocrisy) from Islamic point of view. The book speaks about three basic principles of Islam, source of religion, conditions of testimony of faith, factors that nullify Islam, Tauhid and its categories, Kufr and its categories, nifaq and its categories and the meaning of Taghut.