Terrain Problem! Character begins to wobble extremely!

Hello,
I’ve made a Scene with Terrain and a Capsule as a Character with a 1st Person Camera Script!
But as soon as i walk (with my character) on a hill or something like that, it begins to wobble extremely, more like shaking! And that look horrible with 1st Person! Please help me, I’m a beginner with unity!

I now managed to do it

How did u fixed it?