What are three major differences in the beliefs of these factions of islam?

The Hanafi school of thought: The founder is the Persian scholar Imam Abu Hanifah al-Nu’man ibn Thabit (AD: 699-767). His school of thought is practiced widely in Southeast Asia, Central Asia, the Caucasus, the Balkans and Turkey. The majority of Sunni Muslims practice the Hanfi jurisprudence.

The Shafi’i school of thought: The founder is Abu Abdullah Muhammad Ibn Idris al-Shafi’i known as Imam Al-Shafi’i (AD: 767-820). Imam al-Shafi’i is also known as the “First Among Equals” for his exhaustive knowledge and systematic methodology to religious science. Adherents of this sect are mainly from the Middle East.

The Maliki school of thought: The founder is Malik Bin Anas (AD: 711-795). Its adherents are mostly from North Africa, United Arab Emirates, and parts of Saudi Arabia.

The Hanbali school of thought: The founder is Imam Ahmad Ibn Hanbal (AD: 780–855). The Hanbali jurisprudence is considered very strict and conservative. The Hanbali school of jurisprudence is practiced mainly in Saudi Arabia, Qatar as well as in parts of Syria and Iraq

the answer that is more accurate is:   el profesor nos enseñamos bien.