How did muhammed start spreading his message about islam

Muhammad start spreading his message about Islam by preaching at Mecca, he could spread the message about Islam in an influential way.  

Explanation:

One of the major ways with which Muhammad could spread his message about Islam to the people was by preaching at Mecca. In the present world, Mecca is the holiest place in the world for the Islam religion and is located in a desert valley in western Saudi Arabia. Quran, the holy book of Muslims, was written later by his contemporaries which was based on his own stories.

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