For over 15 years and counting, whenever I am asked about books on aqeedah, I recommend Dr. Umar Sulayman al-Ashqar’s (may Allah have mercy on him) eight-volume Islamic Creed Series. They are available online as pdfs over here for people who wish to check them out prior to purchasing them.
I believe this series will provide one with a solid theological grounding in Islamic theology on essential themes. This book series is good for an intermediate aqeedah student but still digestible by a beginner who craves reading and is interested in the subject matter.
