how to change the text when you hit something in unity code example

Example 1: unity change text

// To change text of a text UI element use th combination below
textGameObject.GetComponent<UnityEngine.UI.Text>().text = "text";

Example 2: unity how to change text in script

Text myText = GameObject.Find("Canvas/Text").GetComponent<Text>();
myText.text = "Your text changed!";