A few foundational books for Shia Muslims include works on the lives of the Imams, the Four Books of hadith, and texts exploring Shia beliefs and doctrines. Some highly recommended titles are Kitab al-Irshad, Bihar al-Anwar, Then I Was Guided, and Nahjul Balagha. Here's a more detailed list of recommended books: Biographies of the Imams: Kitab al-Irshad: by Shaykh Mufid: A comprehensive biography of the Twelve Imams, covering their lives, teachings, and historical context. Bihar al-Anwar: by Allama Majlisi: An extensive collection of traditions and narratives related to the Prophet Muhammad and the Imams. Muntahi al-Amal: by Shaykh Abbas Qumi: Another valuable source for the lives of the Imams. Hadith Collections: Al-Kafi: One of the Four Books of Shia hadith, compiled by Muhammad ibn Ya'qub al-Kulayni. Man la Yahduruhu al-Faqih: Another of the Four Books, compiled by Muhammad ibn Babawayh al-Qummi. Tahdhib al-Ahkam: One of the Four Books, compiled by Shaykh Tusi. Al-Istibsar: One of the Four Books, also compiled by Shaykh Tusi. Other Essential Texts: Nahjul Balagha: A collection of sermons, letters, and sayings attributed to Imam Ali. Then I Was Guided by Dr. Muhammad al-Teejani al-Samawi: A personal account of a Sunni scholar's conversion to Shia Islam. Al-Murajaat: Another book by Dr. al-Teejani, discussing theological and historical aspects of Shia Islam. Fatemeh is Fatemeh by Ali Shariati: A work focusing on the life and significance of Fatima al-Zahra.