I wonder, if you were to describe the Almighty Allah in a sentence or two, how would you describe Him (swt)? In a sentence or two?

Certainly, let me respond to this question with a verse from the book of the Almighty Allah and a hadith containing the words of the Messenger of Mercy. Our Almighty Lord says: “Your God is only One God. There is no god worthy of worship except Him—the Most Compassionate, Most Merciful.” (Baqarah, 2:163). The Prophet (saw) also stated the following to explain this Qur’anic verse: “First of all, there was nothing but Allah.” (Bukhari, Bad’ al-Khalq, 1)

Then how did all the created things come into being?

Allah created all things. Allah created the entire universe. He created the angels, jinn and Satan, which are invisible beings to us. He also created as well the visible world with its plants, animals, human beings, rocks, and landscapes. He created the water we drink and the air we breathe. He (swt) created the sun to provide light and warmth, and the moonlight to illuminate the night. He created the celestial ornaments of the sky with the stars.

Why did Allah create all these? Is there any wisdom behind these creations?