In a Nutshell:
The content of the Qur'an can be summarised as explaining humanity's great unknowns (ghayb) - purpose in life and how best to fulfil this purpose. It helps contextualise this by explaining what preceded the universe, the eternality of God, the gathering of the souls, the primordial covenant, origins of humanity via Adam and Eve, and what will follow it, the eternality of God, and heaven or hell. The contents are often divided into three categories: moral, legal and ethical matters; metaphysical matters including prophecies of future events; and religious, cultural and historical references of previous and contemporary nations.