I'm unable to implement touch control in unity for my c# script, what's wrong with this code, not working

Look i’m total noob in unity scripting, could you please tell me what’s wrong with this code, i’m not able to implement the touch, i want when user taps on the screen, to store that x and y coordinate and move the object to that location, i’m pasting the code, please tell me how to implement it

void controlTouch()
{
    float x,z;
    Vector3 mousePos = Input.mousePosition;
    mousePos = cam.ScreenToWorldPoint(new Vector3(mousePos.x, mousePos.y, cam.transform.position.y - transform.position.y));
    targetRotation = Quaternion.LookRotation(mousePos - new Vector3(transform.position.x, 0, transform.position.z));
    transform.eulerAngles = Vector3.up * Mathf.MoveTowardsAngle(transform.eulerAngles.y, targetRotation.eulerAngles.y, rotationSpeed * Time.deltaTime);
    if(Input.touches.Length > 0)
    {
        //if(Input.touches[0].phase == TouchPhase.Moved)
        //{
            x = Input.GetTouch(0).deltaPosition.x;
            z = Input.GetTouch(0).deltaPosition.y;
            //x = Input.touches[0].deltaPosition.x * runSpeed * Time.deltaTime;
            //z = Input.touches[0].deltaPosition.y * runSpeed * Time.deltaTime;
        //}
        /*else
        {
            x = 0.0f;
            z = 0.0f;
        }*/
    }
    else
    {
        x = 0.0f;
        z = 0.0f;
    }

    Vector3 input = new Vector3(x,0,z);
    currentVelocityModifer = Vector3.MoveTowards(currentVelocityModifer,input,acceleration * Time.deltaTime);
    Vector3 motion = currentVelocityModifer;
    motion *= (Mathf.Abs(input.x) == 1 && Mathf.Abs(input.z) == 1) ? 0.7f : 1;
    motion *= (Input.GetButton("Run")) ? runSpeed : walkSpeed;
    motion += Vector3.up * -8;

    controller.Move(motion * Time.deltaTime);

}

Delta position is the change in the position since the last input update. If you want to get the position of the touch on the screen use the following:

Your code:

x = Input.GetTouch(0).deltaPosition.x;
z = Input.GetTouch(0).deltaPosition.y;

Should be:

x = Input.GetTouch(0).position.x;
z = Input.GetTouch(0).position.y;

If you want to move the object to that position that is another issue. You will have to subtract the objects position from the touch position. That will tell you which direction you need to move the object.