how to wait an amount of time in unity code example

Example 1: wait for seconds unity

//In the example below the script will right "Hello" and 3 seconds later write "Goodbye" in the console
Start()
{
  	//Call the function Example()
	StartCoroutine(Example());
}

Example()
{
  	Debug.Log("Hello");
  	//wait 3 seconds
	yield return new WaitForSeconds(3);
  	Debug.Log("Goodbye");
}

Example 2: wait time in unity

using System.Collections;

private void Start()
{
	StartCoroutine(Wait());
}

IEnumerator Wait()
{
	//To wait, type this:
  
  	//Stuff before waiting
	yield return new WaitForSeconds(/*number of seconds*/);
  	//Stuff after waiting.
}