What are the issues agreed upon by the four schools of thought, and can they be found in a book, audio recordings, or any other source, divided by jurisprudential chapters such as prayer and fasting?

Scholars have paid great attention to issues of Ijma' (consensus), with some dedicating entire works to it, such as Ibn al-Mundhir's al-Ijma' and Ibn Hazm's Maratib al-Ijma'. Among the best of these is Ibn al-Qattan's al-Iqna' fi Masa'il al-Ijma'. Some scholars mention these issues before addressing matters of disagreement. Important resources for Ijma' include comparative jurisprudence books and commentary works. A useful contemporary book is Mawsu'at al-Ijma' fi al-Fiqh al-Islami by Sa'di Abu Jayb. It should be noted that citing Ijma' may, in fact, refer to the opinion of the majority, and a scholar might cite Ijma' due to unawareness of a differing opinion. This is why Ibn Taymiyyah criticized Ibn Hazm's Maratib al-Ijma'.