I have been making an first person game which is set in space and I want my character to rotate according to the platform it is standing on but I found that I am not able to do so,so any ideas?
otherwise can anyone suggest anything else for my situation?please…
It is really important for me and please don’t tell me to get any paid asset 'cause I can’t, not for 6 months at-least. 
We would need to know more about the way your character controller is set up.
Generally speaking, you’ll need to be able to track whether your character is standing on a given object (probably with OnCollisionEnter/Exit/Stay), and keep an eye on that object’s rotation; if the rotation changes, then change the character’s rotation to match.
I am using unity’s default CharaterController Component.