CSHARP

unity wait for seconds

void start() => StartCoroutine(MyIEnumerator());

IEnumerator MyIEnumerator()
{
	Debug.Log("Hello world!");
    yield return new WaitForSeconds(3);
    Debug.Log("Goodbye world!");
}

wait in unity

    IEnumerator wait(float waitTime){ //creating a function
        yield return new WaitForSeconds(waitTime); //tell unity to wait!!
    }
    
    void Start(){
    	print("start");
        wait(1); ///using function
        print("Good night")
    }