Can someone explain to me how map and other works in pico8
(What i mean is when you look at the p8 file in editor you see all the map and other stuff with bunch of number/letters i am asking how are those letters and numbers work

Take a look at the Wiki:
http://pico-8.wikia.com/wiki/Map

It has some pretty good explanations of what the map is and how it's formed.

Thanks

But since you're asking specifically about the __map__ part of the p8 file with a bunch of numbers/letters: That's a hexadecimal representation of the map. It's how it's stored in the cart. You shouldn't have to edit it manually (as long as you own Pico-8, which has a visual map editor), but you can copy/paste that part of the file to another cart to move the map there, that's not a problem.