1. It means God alone created.
The Hebrew verb for "create" can only use God as its subject in Hebrew grammar. That's for good reason. In English, we speak of an artist who creates something, but in truth, God is
2. It means God created everything out of nothing.
Hebrews 11:3; John 1:3 and Colossians 1:16 all emphasize God creating "all things" and creating the visible from the invisible.
3. It means God created by His word.
God simply spoke, and it came into being. Repeatedly in Genesis chapter 1 we see the phrase, "And God said... and it was so."
Psalm 33:6, 9 emphasizes that God created by speaking the word.
No wonder John 1:1 speaks of Jesus as "the word," saying, "In the beginning was the Word."
4. It means that what God created was good.
Another pattern we see in Genesis chapter 1 is the constant repetition of the phrase, "God saw it was good." Finally, when God made mankind in His own image, He said in Genesis 1:31, that it was "very good."
James 1:17 reminds us that every good and perfect gift comes down from God. If it's good, it's from God, and if it's from God, it's good!