Give point on button click

What is the player clicking? A button? An image/sprite? Do you have any code?

If the player is clicking a button you can do some thing like this

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class ButtonClickScript : MonoBehaviour
 {
     public Button button;
     public Text text;
     
     public int currentPoints = 0;
     
     
     public void ClickButton()
     {
         if (button != null)
         {
             currentPoints++;
             if (text != null)
             {
                 text.text = "Current Points" + currentPoints.ToString();
             }
         }
     }
 }

The ClickButton is set up as an event. Here is a little demo of how to do this.

To learn more about this see the Unity Button docs and these tutorials

1. Button Tutorial 1

2. Button Tutorial 2

3. Button Tutorial 3

Now if the player is clicking an image/sprite then you first need to make sure that there is a collider on the game object that has the image/sprite (most likely a Boxcollider2D). You can then do something lie this

 using UnityEngine;
 using System.Collections;
 
 public class ImageClickScript : MonoBehaviour
 {
     public Text text;
     public int currentPoints = 0;

     void OnMouseDown ()
     {
         currentPoints++;
         if (text != null)
         {
             text.text = "Current Points" + currentPoints.ToString();
         }
     }
 }