Tawheed is

Believe to one God

The meaning of tawheed is believe to wahid (one). "No God But Allah".
In this means we must believe to Allah.
We need knowing Islam for us, and if we know about Islam,so we must share to many people. It is duty of entire people to come to Allah.
Concept in Islam is Monopassion or one God.

• The concept of the tawheed is:
  The fundamental to the religius structure of Islam
• If we believe to Allah, it is means we must do what Allah want and what to do Allah doesn't want.