how to access windows files from ubuntu terminal code example

Example 1: How to use my windows file through bash

You'll find the Windows C:\ structure at /mnt/c/ in the Bash environment.

Therefore, my Documents folder is at /mnt/c/Users/Ben/Documents/.

so give comand of cd /mnt/c/ to enter the c file

Example 2: how to cd into local machine using ubuntu subsystem

You will find the Windows C:\ structure at /mnt/c/ in the Bash environment.

Therefore, my Documents folder is at /mnt/c/...

therefore to cd into your directory do 
cd /mnt/c/...