Answer:
By faith we understand that the worlds were framed by the word of God, so that the things which are seen were not made of things which are visible (Hebrews 11:3).
We serve a mighty and powerful God! He created everything — the whole universe — in just six days! And in our Bible verse we learn that the things we see were made from things not seen, or invisible things. In other words, there was nothing (or maybe we should say “not even nothing”) when God began to create.
If you read the first chapter of Genesis, you will see the words “God said” eight times. Shelby, this explains how God created by His great power. For example, can you imagine how amazing it must have been when God said, “Let there be lights in the heavens?” The stars, sun, and moon appeared, just as God had planned. God needed only to speak and everything was created. He truly is worthy of our praise!
Source: https://answersingenesis.org/kids/creation/how-did-god-create-everything-from-nothing//