How to make a 3d W A S D movement in Unity

Script from video: using System.Collections; using System.Collections.Generic; using UnityEngine; public class Movement : MonoBehaviour { public Rigidbody RB3D; // Start is called before the first frame update void Start() { } // Update is called once per frame void FixedUpdate() { if (Input.GetKey("w")) { RB3D.AddForce(0, 0, 50); } if (Input.GetKey("a")) { RB3D.AddForce(-50, 0, 0); } if (Input.GetKey("d")) { RB3D.AddForce(50, 0, 0); } if (Input.GetKey("s")) { RB3D.AddForce(0, 0, -50); } } i prefer to call that script Movement because why not