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Muhammad began teaching in the year 610.
Initially, Muhammad began teaching the principles of Islam in Makkah, confined only to the people very close in his social circle.
Muhammad began the Islamic religion. Muhammad believed that he was divinely given messages, which he wrote down, and they ultimately became the Koran.
Islam as its known by prophet Muhammad's teaching began in Mecca, Saudi Arabia. but in Islamic concept, it began the day when humans were created by god and exact location of it is unknown.
Muhammad married a rich widow named Khadija. Over time, he became troubled by the growing gap between the generosity of most Makkans and the greediness of the wealthy elite. Deeply worried, he began to visit the hills to meditate.
Muhammad started teaching Islam religion in the year of 610 A.D
Muhammad preached that all people are equal and that the rich should share their wealth with the poor . Many poor people began accepting Muhammad's message and became Muslims, or followers of Islam.
Prophet Muhammad (peace be upon him) did not receive any teaching from any human until he received his first teach through God revelation of Quran to him through the angel Jibril (or Gabriel).
Islam began with Muhammad's visions He couldn't read or write, he memorized everything and this became Islam's holy book the Koran -
His Master
Mecca
Prophet Muhammad began his preaching, in year 610 AD, in Mecca (or Makkah) currently in Saudi Arabia.