change material of a part of object unity code example

Example 1: c# change material in code

currentObject.GetComponent<Renderer>().material = materialToAssign;

Example 2: how to change material in script unity

public Material Material1;
  //in the editor this is what you would set as the object you wan't to change
  public Renderer Object;
 
  void Start()
  {
       Object.material = Material1;
  }