Final answer:
Shia and Sunni beliefs differ in the rightful successor of Muhammad, the leadership structure, and the commemoration of certain events.
Step-by-step explanation:
Shia Muslims believe that Muhammad's son-in-law, Ali, was the rightful successor, while Sunni Muslims believe that the community should choose Muhammad's successor.
Another difference is that Shia Muslims believe that the Twelve Imams are divinely chosen leaders who have spiritual authority, while Sunni Muslims do not have a hierarchical leadership structure.
Lastly, Shia Muslims commemorate the martyrdom of Imam Hussain at the Battle of Karbala, which is a significant event in their religious calendar, whereas Sunni Muslims do not observe this event as a religious holiday.
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