Android system folders

where can i get documentation about system folders such as /dev /sys /system I want to know what normally exists in such folders (I want Operating syst开发者_StackOverflow社区em internals information)

The android operating system is based on linux so you would be best starting with the standard linux structure

You should be aware that all versions will be modified slightly so a precise definition of what folders are there may change depending on the device and manufacturer.

Merlin answer seems good, but I really explore internal memory of my phone using DroidExplorer

so you can discover system folders. good luck