What is wrong with My code?

Questions & Answers
1

I am trying to make a VERY SIMPLE zoom in scope with this code. But it says an error tho:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ZoomScope : MonoBehaviour
{

// Update is called once per frame
void Update()
{
		if(Input.GetMouseButtonDown(1) {
		 GetComponent<Camera>()(targetFieldOfView = 70);
		}
}

}

2

You need to learn basics of Code first!

void Update()
 {
         if(Input.GetMouseButtonDown(1) {
          this.GetComponent<Camera>().targetFieldOfView = 70; //or 70f;
         }
 }