How to make a simple jump script in 3D C#

I need to know how to make a simple jump script so i can make 3D game where you can jump.

public float jumpHeight = 7f;
public bool isGrounded;

private Rigidbody rb;

void Start()
{
 rb = GetComponent<Rigidbody>();
}

void Update()
{
   if (isGrounded)
   {
      if (Input.GetButtonDown("Jump"))
      {
      rb.AddForce(Vector3.up * jumpHeight)
      }
   }
}

void OnCollisionEnter(Collision other)
{
    if (other.gameObject.tag == "Ground")
    {
        isGrounded = true;
    }
}

void OnCollisionExit(Collision other)
{
    if (other.gameObject.tag == "Ground")
    {
        isGrounded = false;
    }
}

Make sure to add a tag with the name “Ground” onto the ground object and your done.

**Warning : ** Untested code … A direct copy N paste may make you to to ask a new question on this forum

Add gameobject, add Rigidbody to it, add script to it … and in that script add this

public int forceConst = 50;

private bool canJump;
private RigidBody selfRigidbody;

void Start(){
    selfRigidbody = GetComponent<RigidBody>();
}

void FixedUpdate(){
    if(canJump){
        canJump = false;
        selfRigidbody.addForce(0, forceConst, 0, ForceMode.Impulse);
    }
}

void Update(){
    if(Input.GetKeyUp(Keycode.SPACE)){
        canJump = true;
    }
}

Take a look at AddForce