Here is my work on Kether, it is not yet complete actually it is far from ever being complete but here is what I have done so far.
Kether is known by a few names, originally In Hebrew. The name is mostly similar to Kether some examples are keether,keeter,keter there is also the vodou names Damballah & Ayida Wedo, these are all the same sefirot just different names, obviously there are more then this but this is all I came through so far.
Kether means the supreme crown, if you look at pictures sometimes there is a crown placed above it, I assume this is a point of royalty I also assume it is interpreted as the topmost of the sefirot and the supreme one, as the crown is a symbol of royalty.
It is placed between Chokmah and Binah. (Chokmah to the right and Binah to the left) and is placed above Tiphareth. It is usually given three paths, to Chokmah, Tiphereth, and Binah. It is pictured as white brilliance but upon research it said that Kether has no color and is invisible.
It is placed in the pillar of balance along with three other sefirot thus, making four in the middle pillar those four are Tipareth, Yesod, Malkuth and Kether.
This pillar represents the equality between male and female or the left and right pillars.
It is also in the supernatural triangle along with Binah and Chokmah. In christianity this is referred to as the "holy trinity" The Trinity constitutes the esoteric core of our Being, and has been referred to as the Resplendent Dragon of Wisdom. Kether is the center of gravity of the Logoic Triangle.
If we look at a diagram of the Tree of Life, we can see that Kether is a sephiroth that is very far away from Malkuth, the physical world. This is why we cannot easily understand or relate to our Father who resides in secret. Although objects and events that take place in Kether are real and mathematically exact, they seem abstract and remote to our minds. The religion of Buddhism has its center of gravity in Kether, and this is the reason why many people find it difficult to relate to and understand its concepts and teachings.