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The Hebrew language doesn't have vowels. And because no one's meant to say "YHWH" out loud, we don't know what the vowel sounds for the word are wink "Yahweh" is the best present guess. But many people prefer YHWH, which are the Hebrew letters Latinized.

Something like that anyway.

I think they both have to do with it being a sin in Judaism to write or speak God's name. I know that's true for writing G-d.
From what I understand, it's wrong to write His name in a way that it can be destroyed. Like if you write "God" on a piece of paper, and somebody erases it or crumples it up and throws it away, that's wrong.
So writing G-d instead prevents that.

Even if it was said in awe/respect/love? That doesn't make sense to me....

i once heard that if they do write it down it has to be with a brand new, never used before pen as well, and that they weren't supposed to use the pen ever again...

in hebrew writings, because to portray the name would be to diminish it and break the command about not treating God's name like a small thing,

the divine name was often represented by a symbol, the shape of a diamond, called the tetragrammatron.

YHWH are the consonants for the divine name and also coincide with God's disclosure to Moses at the burning bush where he said "I AM WHAT I AM"
(same letters).

to this name were added the vowel points of the word "adonai" which means LORD; together the two words (YHWH and the vowels of adonai) were pronounced as "Jehovah".

In many bibles, when you see the word lord printed in all capitals (LORD) in the Old Testament, that means that it stands for what in the original text was either the tetragrammatron or YHWH.

YHWH is the original, true spelling of God's name in roman lettering. Or, depending on whether you switch the direction, HWHY if you want to read it right to left. Yahweh, as it is often written, is a phonetic word made to sound as close to the pronunciation as possible to the Hebrew name. The real name is the tetragammaton, those four letters. There's power in there in terms of symbolism-

For example, find the permutations of YHWH, (4x3x2x1=) 24. If you look at a star of david, it has seven shapes- the six triangles and a hexagon in the middle. If you count the angles of each shape, or connect them to a central point in each shape, the number of angles or triangular segments respectively is 24.