No problem! The thing that stood out to me was calling dimensions different universes. That does make sense, but personally I view it as alternate planes of existence. Like we see the Mirror Dimension as another plane on the timeline. The same goes for anything else in the dimension category. Another example is that I see the Ancestral Plane (Wakandan afterlife) as tethered to this universe/timeline (those 2 are interchangeable for the most part) because the people who died existed in the plane of reality. For the most part, their bodies remain in the physical dimension, but extensions of them are sent to the Ancestral Plane. For Kun Lun, Ta Lo, and the Noor Dimension, those are different physical dimensions attached to the same universe/timeline, that also exist physically rather than an afterlife. Usually normal people can access them (if they know how), like Kun Lun and Ta Lo, but the Noor has different rules.

Basically dimensions are different planes in a universe/timeline, with each universe/timeline having their own copy like you said. Some dimensions can be accessed physically, while others are accessed differently like an afterlife. The Quantum Realm is kind of shared with all other universes/timelines like you said. I think that sums everything up and hopefully that made sense lol.