C#, is this how you use a coroutine properly?

I'm trying to understand coroutines, so I tried to apply them to a little game.

The script works perfectly but I don't know if this is the proper way to use a coroutine. Is there any alternative to what I did?

 using UnityEngine;
 using System.Collections;
 
 public class scriptEnemy : MonoBehaviour {
     //Inspector variables
     public Color[] shapeColor; 
     public int numberOfClicks = 2 ;
     public float waitTime = 1f;
     
     //Private variables
     
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         if(numberOfClicks <= 0)
         {
             Vector3 position = new Vector3(Random.Range(-9f, 9f), Random.Range(-5f, 5f), 0);
             RespawnWaitTime();
             RandomColor();
             StartCoroutine(RespawnWaitTime());
             transform.position = position;
             numberOfClicks = 2;
         }
     }
     
     //Used to hide the object for a certain amount of time
     IEnumerator RespawnWaitTime()
     {
         renderer.enabled = false;
         yield return new WaitForSeconds(waitTime);        
         renderer.enabled = true;
     }
     
     //used to change the material color of an objects
     void RandomColor()
     {
         if(shapeColor.Length > 0){
             float newColor = Random.Range (0f,(float)shapeColor.Length);
             renderer.material.color = shapeColor[(int)newColor];
         }
     }
 }