The object is spinning near the center, not in the center, how to fix this?

Question

C++ / C#

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class slcamera : MonoBehaviour
{
    public float offset;

    void Update()
    {
        Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position; ;
        float rotateZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotateZ + offset);


    }
}

I'm just starting to study units, the code is taken from the Internet, and is almost not understood by me.

Answer 1

I advise you to first study or finish your studies if you don’t understand the C# unity code, well, or C# itself if you don’t know it, since there is nowhere to develop without it. I can advise a free course from
ANDROIDHELPER
But still, about your question, I will make a test project with your code and the object (3D object) will spin quietly
, standing in place, maybe this is not what you wanted to achieve, if so, explain in more detail what do you want to achieve