What does Tawhid (Oneness of God) mean?

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 Imam Al-Junayd said, “Tawhid is differentiating the Eternal [i.e. Allah] from the created.” Allah is eternal, meaning His existence is without a beginning; whereas, the created exists with a beginning.  

Suratush-Shura Ayah 11 means, “Nothing is like Allah in any way.” Al-Bukhariyy related that, “The Prophet was asked about the best of the deeds, to which he replied, ‘The belief in Allah and His Messenger’”.