Muhammad is considered as the last prophet with Allah. His starvation in a month with only a loaf of bread also created Ramadan. He followed Allah and also recorded Allah's word in the Quran which his scribes wrote.
After Muhammad passed away, there had to be caliphate, the leader of the Islam religion and Abu Bakr was chosen, as he was Muhammad is his son in law and close friend
In modern times, Muslim people have gotten a bad reputation because of organisations such as I.S.I.S and many people, as a result, have bullied and stereotyped the rest of the people. This is not right and should not be done because you can't stereotype everyone because of one thing. There should be no one bullying anyone no matter what.
There were four caliphates after the death of Muhhamad and the Arab Muslim religion conquered most of the Middle East and even spread to Europe, Africa and Asia
There are two main sections of the Muslim religion. There are the Sunnis and Shiites. The Sunnis believe that the four caliphates were the successors of Muhammad and the Shiites do not believe in the first three. They only believe in Ali, the last of the four caliphates
The Quran is the book that Muslims read similar to the Christians and the Bible. Muhammad is the one who spoke Allah's words for the Quran however he didn't write it, his scribes did