Who is Allah?

"Allah! There is no God but He, the Living, the Self-Subsisting, Supporter of all, no slumber can seize Him nor sleep, His are all things in the heavens and on earth. Who is there can intercede in His presence except as He permits? He knows what (appears to His creatures as) before or after or behind them.

Nor shall they compass anything of His knowledge except as He wills. His Throne does extend over the heavens and the earth, and He feel No fatigue in guarding and preserving them for He is the Most High, the Supreme (in glory)."

Surah Al-Baqarah, 2:255

Does Allah have a partner?

"Say: 'Praise be to Allah, Who begets no son, and has no partner in (his) dominion: Nor (needs) He any to protect Him from humiliation: Yes, magnify Him for His greatness and glory!"

Surah Banee Israeel, 17:111

Are there other gods besides Allah?

"No son did Allah beget, nor is there any God along with Him: if there were many Gods, behold, each God would have taken away what he had created, and some would have lauded it over others! Glory to Allah! (he is free) from the (sort of) things they attribute to Him! He knows what is hidden and what is open: too high is He for the partners they attribute to Him!"

Surah Al-Moominoon, 23:91-92

Is Allah a part of a Trinity?

"They disbelieve who say: Allah is one of three (in a Trinity): for there is No God except One God. If they desist not from their word (of blasphemy), verily a grievous chastisement will befall the disbelievers among them."

Surah Al-Maa'ida, 5:72

Does Allah have a son or a daughter?

"And they falsely, having no knowledge, attribute to Him sons and daughters, praise and glory be to Him! (for He is) above what they attribute to Him!"

Surah Al-An'aam, 6:100