@Combine_Advisor Charles, I hope that you understand that this is not a simple question. Evangelicals seem to have the idea that language is simple, univocal, which it is not. If it were then God could not use it to express to us God’s deep profound truth.
Let me begin with the earliest understanding of God by the Hebrews, which scholars call henotheism, “adherence to one particular god out of several, especially by a family, tribe, or other group.” In other words the Ten Commandments say, “You shall have no other gods before Me (YHWH,”) so YHWH does say that other deities do not exist. On the contrary YHWH says put be over them. There seems to be an evolution from put Me over them to I am superior to them, to they are weak or false gods, to no other deities exist.
Henotheism is a totally false view of God. Some Christians think that it cannot be in the Bible, but it is because God comes to humans as they are, so God can remakes us into who we need to be in right relationship to God.
The Semitic pantheon of the Hebrews consisted of El as the high God with all of the lesser gods (elim), presumably including YHWH underneath El, even though it was the elim who exercised the power.
As you noted the word used in Gen 1 for God is Elohim, a plural, based on the word el, god. One theory is that YHWH took on all the powers of all the gods to become the One and Only True God, and thus an el/god became Elohim/God. That is just a theory that makes sense from a certain perspective, not absolute truth,
The other word for God used in the OT is YHWH, usually translated the LORD and some times mistransliterated Jehovah, is the sacred personal Name of God, which needs its own special study. .