Reducing friction to zero on my terrain's vertical walls. unity 3d

Hi, I was wondering if anyone could tell me how to make my sloped terrain along the outer edges zero friction so the player cannot just jump up a vertical wall and jump off into space.Please. I don’t know much about the C# scripting, so i would probably have to cut and paste your code for it to work. or at least get a description of how to code it. Any help greatly appreciated. Thank you

You can’t add a physics material to just one part of a Terrain, and you might not want to have that enabled for the whole thing. An alternative approach, and one you can Search for, is to get the hit.normal and see if it’s too steep, if so block the jump.

I Googled this:
Unity prevent character from jumping up steep terrain

and saw a few good posts.