how to delay period in time unity 3d code example

Example 1: Time delay C# unity

void start()
StartCoroutine(Text());

IEnumerator Text()  //  <-  its a standalone method
{
	Debug.Log("Hello")
    yield return new WaitForSeconds(3)
    Debug.Log("ByeBye")
}

Example 2: delay in unity

Invoke("functionname", seconds);
// this is for C#