There are 99 names of Allah revealing his many qualities. The belief in the One God is the most important Muslim belief which is reflected in the Shaddah.
Shahadah quote on Tawhid: "There is no God but Allah and Mohammad is his messenger."
Qualities of Allah include:
Immanent (close)
Transcendent (Beyond our understanding)
Beneficient (Kind)
Merciful (Kind)
Just (Fair)
Quote from Qur'an on Tawhid: "He is God the one, God the eternal. He begot no one now was he begotten. No one is comparable to him."
Quote from Qur'an on nature of Allah: "His mercy takes precedence over his wrath"
Quote from Qur'an on nature of allah: "He is able to do all things"