Dimensionality

Can anyone help me with this, i tried to look it up on wiki and it made no sense to me

For the longest time i thought that dimensionality of a character was decisive but now i hear that if a 3D character can bust multiple multiverses each containing an infinite amount of universes, that upscales them from a 5D character

And I also thought that since time is generally considered the 4th dimension, shouldnt all 4th dimension and higher beings be able to travel through time/maanipulate it freely?

So is any of these things right or am i just coping real hard

If i am coping real hard then can anyone explain it to me?