How to call a method from one C# script in another script in Unity?

Question

C++ / C#

Unity
has a crypt with a method: public void ShowInterstitial()
I need to call it in another script, in the Die() method,

did I do it right

public GameObject ssilkaNaFirstScript;

 private void Die()
    {

        ssilkaNaFirstScript.GetComponent<FirstScript>().ShowInterstitial();

    }

Answer 1

Then right away

[SerializeField] private FirstScript ssilkaNaFirstScript;

 private void Die()
    {

        ssilkaNaFirstScript.ShowInterstitial();

    }