And God said, “Let there be light,” and there was light.
וַיֹּ֥אמֶר אֱלֹהִ֖ים יְהִ֣י אֹ֑ור וַֽיְהִי־אֹֽור׃
And God said… Now begins the creation proper. The presence of the conjunction “waw (and)” informs us that God’s speaking occurred in the next step of a linear account. “1:2 The Spirit of God moved upon the face of the waters. 1:3 AND God said….” Such a usage of “waw” to attach consecutive events also happens in Genesis 5 and 11, both of which are genealogical accounts. After God had laid down the great waters of the Earth, He now went to work shaping it. He made light first, meaning that it is so important as to be given preference over any other thing.