May I ask you to re-read the second part of my last reponse and put it into your own words what you understood? Please ask, if you don’t understand something in the response, before you introducing new/different information. It will be less frustrating for both sides 
There is no such thing as a redirect of folders!
If you have host folder /a and bind it into container folder /b (using -v /a:/b), whatever you put on the host in /a, will be seen in the container /b and the other way arround. The left hand side before the colon is always the host side, the right hand side after the colon is always the container side. Please always use the container side as written in the image description, as the applicaion usualy is prepared to work with those pre-defined folder - unless you know exectly why you are doing it differently and how to configure the application inside the container to work with the modified location.
May I suggest this fabulous docker training: Introduction to Containers. It should give you a proper foundation to undestand how docker works and how it needs to be used.