Unity Terrain Texture Stretching

Question

I am new to Unity's terrain system and was trying to create a terrain for a game. I finished my terrain and then wanted to begin texturing it, to my dismay the textures that I'd try would become extremely stretched due to the height I have some parts of the terrain set at. I have been looking for a solution to this problem and I tried to do the Triplanar Shader mapping but it seems to not work either or I did it wrong. All of the floors look fine its just the sides of the terrain that get stretched. What should I do to try to fix this issue? Am beginner