If you can only perceive 1D you just see a line of digital bits with 1 relational layer (left and right).
If you zoom out you can perceive you same 1D data but simplified in to 2D using an extra relational information layer of up/down. Now each bit has 4 relations.
Zoom out again and you have 3D (depth relationships). The so called holographic principle.
Zoom out again and you perceive 4D (temporal relationships).
Now visualize getting up to the scale of cities. All the people talking to each other can be considered the digital "bits" or nodes of this layer. Zoom out from that and now the cities are the bits/nodes of this layer. Another dimension has been added to the "people bits".
You can just keep going up and down perceiving layers of simplified relationship information, like a fractal.
If you go down to 0D it's a singularity. You'd see all the bits of the universe together as 1 bit because there is no relational information for them.
If you go up to "infinity" D you end up perceiving the whole universe as one bit, the same as 0D. Unless there are literally infinite universe entangled with each other then it keeps going like a fractal.
I'm not sure about negative dimensions.
Thanks all dimension are! It's super basic.