CubeController.cs

CubeController.cs

using UnityEditor;
using UnityEngine;
using DG.Tweening;

/// <summary>
/// Attribute to select a single layer.
/// </summary>
public class LayerAttribute : PropertyAttribute
{}

[CustomPropertyDrawer(typeof(LayerAttribute))]
class LayerAttributeEditor : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        property.intValue = EditorGUI.LayerField(position, label, property.intValue);
    }
}

[RequireComponent(typeof(Rigidbody))]
public class CubeController : MonoBehaviour
{
    [SerializeField] private float moveSpeed = 15f;                                 // cube movement speed, applied to Rigidbody.MovePosition
    [SerializeField] private float jumpForce = 30f;                                 // cube jump force, applied to Rigidbody.AddForce
    [SerializeField] private float fallMultiplier = 10f;                            // determinates fall gravity multiplier (how fast a cube will fall after jump)

    [SerializeField, Layer] int groundLayer = 0;                                    // ground layer selector (instead of tags? :3)

    [SerializeField, Range(1, 360)] private int spinAnimationAngle = 180;           // (DG.Tweening) DORotate target angle
    [SerializeField, Range(0.1f, 1.0f)] private float spinAnimationTime = 0.75f;    // (DG.Tweening) DORotate target animation time

    private Rigidbody _rb;
    private bool _doJump = false;                                                   // used to transfer input from Update into FixedUpdate
    private bool _isJumping = false;                                                // determinates if a cube is currently jumping or not


    void Awake()
    {
        _rb = transform.GetComponent <Rigidbody>();
    }

    void Update() {
        // Unity built-in Input Manager
        if(Input.GetButtonDown("Jump") && !_isJumping) {
            Jump();
        }
    }

    // FixedUpdate is called once per Fixed Timestep (50 times/second default)
    void FixedUpdate()
    {
        // move the cube forward
        Vector3 moveVector = Vector3.forward * moveSpeed * Time.deltaTime;
        _rb.MovePosition(transform.position + moveVector);

        // check for a jump input
        if(_doJump) {
            _rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
            _doJump = false;
        }

        // Gravity fall multiplier
        _rb.velocity += Vector3.up * Physics.gravity.y * (fallMultiplier - 1) * Time.deltaTime;
    }

    void OnCollisionEnter(Collision collision) {
        // CompareTag is alot performant than equality-operator or TryGetComponent
        // but still, it is much faster to use layers :3
        // (if you interested in such micro optimization)
        if(collision.gameObject.layer == groundLayer) {
            if(Input.GetButton("Jump") && _isJumping) {
                // Bunny Hop
                Jump();
            } else if(_isJumping) {
                _isJumping = false;
            }
        }
    }

    void Jump() {
        _doJump = true; // set flag for FixedUpdate
        _isJumping = true; // set jump status

        // some cool DG stuff :]
        transform.DOComplete();
        transform.DOShakeScale(.5f, .5f, 3, 30);
        transform.DORotate(new Vector3(spinAnimationAngle, 0, 0), spinAnimationTime, RotateMode.LocalAxisAdd).SetRelative(true);
    }
}

Hello Abraham, dont worry about your self, Roman is idiot, no reason to look to Roman he is Unity Noob Developer. But, why Jump Controller? Roman has really good video about this.

Best wishes,
Konstantin

Yeah, just renamed the file to "CubeController", makes more sense.
Thanks!