If you want to make an object spin in Unity, just attach this simple script to it:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class MakeItemSpin : MonoBehaviour
{
[SerializeField] Vector3 rotateSpeed;
private void Update()
{
transform.Rotate(rotateSpeed.x * Time.deltaTime, rotateSpeed.y * Time.deltaTime , rotateSpeed.z * Time.deltaTime);
}
}
Set a spin speed in the Inspector. Set the rotate speeds for each axis in the rotateSpeed Inspector slot.