This is a guide to comprehending five dimensions, and how they work.
The null dimension
Not too hard to understand this one.
Imagine a single point, with no length, width or height. This cannot interact with other things, and thus neither exists or can be measured.
The first dimension
Again, a fairly simple concept.
Say we took that null point from before, and gave it a length, width or height. This still could not interact on the third dimension, as it is simply a line. This has no physical properties, as nothing can exist inside this line. It can only be measured in one dimension.
The second dimension
You are probably familiar with this one. However, a two dimensional object cannot reflect light, as nothing can be within. It may have a surface area, but it has no depth, so it still cannot interact with other objects in the third dimension.
The third dimension
If you do not already know how this one works, you must have a lot of trouble in everyday life. Humans can only comprehend the third dimension naturally. An object in the third dimension has length, width and height. This can interact with other objects.
The fourth dimension
This is experienced every day, but only one place at a time. Just as a 2d object is just one cross-section of a 3d object, the 3d object is just one point of a 4d object.
If we dropped a cube onto another object, we will see it move. In the fourth dimension, we could see any part of this movement at will. Just as we can see any point along the height of a pole, we could see any point in space at any point in time. However, we would only see the future in a single way, as a pre-determined pathway without:
The fifth dimension
Just like the fourth dimension deals with points along a timeline, the third dimension deals with points along a third vector, the second dimension deals with points along a second vector and so on; the fifth dimension deals with points along many different timelines.
If you could see five dimensions of a certain physical point, not only could you see the height, width, depth and timeline of it, but you could also see every possible situation that point could have been in. If this is hard to understand, try this:
Let's take a point on Earth, next to a beautiful lake. Now, we could see the Earth spin under this point along the timeline in the fourth dimension, from the time this point existed to the point it stopped existing. If we saw the same point in the same time, but in the fifth dimension, we could see any possible configuration of this scenery. Instead of this beautiful lake, perhaps Earth formed an identical lake out of lava instead, and Earth is a barren mess of volcanic activity. Or, perhaps, the lake was two centimeters deeper than the one we saw.
I kinda lost myself a bit while writing this, so if this makes no sense, tell me.