This work is a summary of the book Al-Qawl Al-Mufid Sharh Kitab At-Tawhid by Shaykh Muhammad Ibn Salih Al-Uthaymin. Despite its brevity, it is comprehensive in elucidating the issues related to Tawhid and its antithesis: shirk (polytheism). It also contains points unmentioned in all of the existing books on tawhid (in the English language). We have included the grading of all the ahadith contained in the original based on the checking of scholars of hadith such as Shaykh Muhammad Nasir Ad-Din Al-Albani and Abdul Qadir Arna’ut and an appendix outlining all the ahadith and athar (narrations) that have been deemed unauthentic by the scholars.