Detect OnTriggerEnter with tags

Hello,
I am wanting to detect if this game object has hit another game object tag ground if so I want to play and animation and I want to play a sound.
Unfortunately I cannot find how to detect the grounds tag. I know this is simple, I am missing it.

Thanks for the help
Daniel

PS: Also I would like to know if i am coding the correct way to play a different clip on the same audioSource?
Alos would I use AudioClip or Audio as my var class type.

function OnTriggerEnter (gameObject.tag ="ground" : Collision) {
	fallingAnimation.Play();
	audio.Play("CrashSound");
	
}

var audioClip : AudioSource;

function OnTriggerEnter(collider : Collider)
{
    if(collider.tag == "ground")
    {
        fallingAnimation.Play();
        audioClip.Play();        
    }
}

or this if you dont want to use triggers:

var audioClip : AudioSource;

function OnCollisionEnter(collider : Collision)
{
    if(collider.gameObject.tag == "ground")
    {
        fallingAnimation.Play();
        audioClip.Play();        
    }
}

In regards to playing audio I don’t have much experience but I believe you need to reference a separate audio source for each sound you want to play and call .Play() on that audio source.
Also make sure that you have your objects set up right so that they can detect collisions: