Friend, you ask good questions but understand that I am just starting to see the differences between the Greek and Hebrew.
Well Keypurr, I am glad you are starting to try.
I do not fault you in this as I believe the Greek NT kind of drops the issue unfortunately. My personal belief is that the state church of Constantine and later Roman emperors may have destroyed earlier non-Greek manuscripts, and generally followed the practice of the Septuagint which replaced YHWH with the Koine Greek, Kurios, which was a generic Greek word for lord or master. I believe the Jews were even responsible for this because of their belief at the time that YHWH was too holy to pronounce or transcribe into other languages. The Greek Kurios is actually the equivalent of the Hebrew adon, or lord. YHWH simply did not get transcribed into Greek or if it did it got destroyed. I have actually found some references from Jewish scribes at the time who said they destroyed any Greek manuscripts they found which did this.
From what I understand YHWH is the name of the Father.
It is one of His names, but the teaching that only the Father is YHWH is a Jewish one. Posters like Elia and Ben Masada regular post this teaching here at TOL. What the Tanakh actually says tho is different, as I am showing to you.
Elohim is more deversified in its meaning. It's been a long time that I gave a serious look at the OT.
I am not criticizing you Keypurr, but inviting you to look. I don't think one can get an accurate picture of God solely from the Greek NT. The Syriac Peshitta version of the NT does use "Marya" for Jesus which is essentially the Aramaic shorthand for "YHWH." Later books introduced into the Peshitta however, don't seem to use it for YHWH as consistently, but it seems to get confounded with the generic lord at times.
The English translations of the Bible tend to follow the Greek practice of using a generic "LORD" for YHWH, thus not relaying the meaning of the name at all, but I pose it is important to understanding "God" since God seems to have a practice of using a name relating what He is being for the people.
What is JHWH? Elohim can mean God, or a god or even a being with a special purpose. At least that what I have read. So that in itself causes confusion, at least to me friend. But I do not give up easily.
It has become very confused to people friend, which is why I bring it up. Probably the best Hebrew equivalent to the English "God" is El which roughly means "the power." English is a Saxon language. Saxons were Teutons who conquered the western Roman empire. The Teuton word for "God" was "Gott." The Goths meant basically the "people of God." Roman records show they came from the East, and they are on record in the third century as giving Rome trouble in what is now Turkey, and was then the Eastern Roman Empire or later the Byzantine Empire (after the West fell to the Teutons). I believe they came from Parthia, which was basically the land of Babylon and where the 10 tribes ended up after spreading a little from Assyria ie Turkey.
The plural of El is Elim, and actually appears in the Bible in the Hebrew transliteration from Aramaic Daniel.
The plural of Eloah is Elohim. Eloah is not widely used in the Bible, but is used of God primarily when speaking of being the stone of Israel or the Rock of our Salvation in the OT ie Tanakh. Thus, Elohim is not the same as El at all. I believe it means something akin to the family of stone/immovable force. This explains why He says things like I am an El of Elohim or the God of gods in Deuteronomy.
YHWH is not as clear. Individually, the letters can mean Behold the hand, behold the nail. The small yod letter being peg or nail. The word it forms means something like I breathe, or I exist or from the earliest Hebrew idea, I have breath - I live. "I am" is another rendering. Thus in the OT where God says "I am the LORD your God, or transliterated I am YWHW your Elohim, He is saying something like I am the breath, life, word of your family of stone/immovable force - over and over again in the Bible. I realize this will sound very new to you, but I am happy to discuss this with you to whatever length you like.
Understanding these types of things has really helped me "demystify" God.