Why did God create Heaven and Earth?

Answer 1

I guess he wanted some company! Just as parents have the desire to have children, I guess God had the desire to create also. The Bible says:

He "did not create [the earth] simply for nothing" but "formed it even to be inhabited." (Isaiah 45:18)

Another answer:

There is currently no evidence to suggest that any of these four propositions are correct (that God exists, that Heaven exists, that Earth was created, that God created heaven and earth). Hence, any reasons given are only hypothetical possibilities.

They include:

• out of boredom;
• because he/she/it can;
• to provide a place for life

and other indirect reasons.
To move the plot forward.

Answer 2

Yes,

God created earth and Heaven and God created also the Paradise and Hell.

As God rewards good people with the Paradise per His mercy, God punishes with pushing in Hell who deny the oneness of God and worship partners with him.

Answer 3

Why do humans respond emotionally to beautiful sights? And why are painters, sculptors, or musicians motivated emotionally (even beyond monetary need) - to create works of beauty? We are created in the image of God (Genesis ch.5), and God himself is a master artist, who (we intuit) enjoys beauty and has made this beautiful world (see Genesis 1:31). The best human efforts to create beauty are a pale reflection of God's own designs. We respond to them because we are made in the Creator's image.
God made the Earth for people: "He did not create [the earth] simply for nothing," but "formed it to be inhabited" (Isaiah 45:18). He wanted people to exist in order to have someone to love, and to give us an opportunity to achieve godliness. All people are tested concerning their use of free-will. We possess a soul which lives on after the body dies and is held responsible for the person's actions. Anyone who is worthy can merit reward in the afterlife. When the righteous use their free-will to obey God despite His being hidden, they have shown that they deserve His love. Their reward will never cease. But even the undeserving are given the kindness of life in this world, and the lifelong ability to draw near to Him.See also:

God's wisdom seen in His creations

More about God's wisdom

Can you show that God exists