Make a reflective surface I am designing a copper top of a flag post. 

How do i make the surface texture reflective, so that it can reflect every object and light in the environment?
Enable cycles render and add a new Principled BSDF material for your object. 
Set metallic to 1.
Find the correct base color for your metal.
Adjust roughness based on how sharp or blurry you need the reflections to be.