If you want to go deep: Kabbalah. It can explain a lot of things.
If you want a nice synthesis with a modern approach of everything: Reality Transurfing.
Discussion
Looked it up briefly and it sounds a bit too mystical. I don’t understand why humans must always humanize concepts they do not understand and shape them as some magical human event.
But yeah maybe I’ll prompt that a ton.
RT is a physicist trying to explain espiritual concepts, multiple dimensions, multiple realities and you can pick up the reality you want using some techniques. I see influence from western esoteric teachings here as well, Kabbalah tries to understand the qualities of God how he create things and how to use this knowledge and how it relates to our reality. It is the root of 90% of they mystical schools in the west.
In the end you need to put into worlds and try to understand what you discovered. Or you can assume nothing is true and everything is silence and you can meditate in this silence as well.
Reality Transurfing looks wild. I wonder if anyone got it working 😂