To understand what Magic, Other Worlds are and what kind of work we are doing, the reader must get a basic understanding of a Multidimensional World.
The world has dimensions in which we can measure and evaluate objects.
If we take a 2-dimensional space, it can be infinitely large, but when we add a 3rd dimension to it, the infinity gets multiplied. Take, for example, the surface of our planet, and it is a thin crust. Then add depth to it, and the number of objects and information contained will become immense. With each dimension uptake, there is a progressive increase in the difficulty and volume of data. Take a snapshot of a moment and check how much a picture is worth compared with a 24-hour movie. Now, think about many billions of years.
Time is the 4th dimension; take the 3rd-dimensional reality and multiply it by billions of years. If there is only one timeline, the world is infinitely massive, but what if there are myriads of timelines and parallel worlds? In reality, explored by Advanced Magi, the world we research has more than three, five, or seven dimensions. It does not mean anything if a common person or object in the universe cannot perceive, see or hear beyond small reality and gets lost in the three pines.
For example, we put an animal on the surface with four footprints. For the 2-dimensional surface space, four objects will be moving, appearing, and disappearing at different times and coordinates. It would not be easy to understand from 2D perception how those four objects are connected and why they move and work together. Those four objects "may call themselves" a dog, and none will truly be a dog as 2d space cannot fully describe a three-dimensional object.
A chair or a phone you got is an object; you can hold it, turn around, and throw it. It seems tangible enough. But if you move in 4D-Time, back a dozen years ago, that object does not exist yet. You move forward in time, and the object will cease existence.
You take a radio wave or a signal, which is real; it exists, but it only exists and is transmitted in a certain frequency and not elsewhere.
You cannot see radio waves with your eyes or touch them with your hands. But it is a critical part of our daily life in the modern world, to the point when an internet shutdown would cause a global collapse of all the markets and institutions.
A lower dimensional existence cannot grasp higher dimension reality like an NPC character inside a game cannot realize the game itself. If a primitive being cannot see above its existence, it cannot comprehend or truly sense the beings of the higher world.
It is also why many humans, throughout history, succeeded at presenting themselves as enlightened beings, spiritual deities, and god incarnations, as nobody has the tools to evaluate and verify spiritual reality. When unawakened being looks at another human, they see an outer shell, a physical body. It is like seeing a computer hard drive but being unable to peek at what is inside. What kind of information and spirit resides in the vessel?
In public spiritual traditions, there is a common excuse for their practitioners not having this third-eye ability to discern and see through the nature of reality itself. They tend to seek physical representations of spiritual advancements. Those can often be staged and orchestrated, leading to many cults' rise. In this setting, a depraved demonic being could play a role of a holy saint.
A higher being is not a being that is bigger or stronger in 3 dimensions; the higher being is the one whose existence spreads beyond three dimensions. Dinosaurs used to be big and strong, but they do not exist now. A higher being could have lived in the Dinosaurs era and still exist today.
Physical reality is only a tiny part of our universe. All modern science, physics, and technological advancement are relatively trivial compared to the complexity and difficulty of reality. Living in a physical body limited by five senses is a measly life experience, like living in prison.
Self-development path ties to an ability of an Adept to grow the knowledge and understanding of the world. Learning and understanding higher spiritual and subtle planes opens the way to freedom. If you want to travel and explore the world beyond physical limitations, there are two methods available to everyone with some training - Lucid Dreaming and Astral Travel. In both cases, the physical body takes rest, and many limitations of a bodily vessel become void.