How To Rotate Camera In X Y Axes In Unity With Mouse Press | Unity 3D Tutorial at https://youtu.be/FIiKuP-9KuY

RotateWithMouse.cs

using UnityEngine;

public class RotateWithMouse : MonoBehaviour
{

    public float Speed = 5;
    
    void Update()
    {
        if(Input.GetMouseButton(0))
        {
             
            transform.eulerAngles += Speed * new Vector3( -Input.GetAxis("Mouse Y"), Input.GetAxis("Mouse X"),0) ; 

            //transform.Rotate(transform.up ,-Input.GetAxis("Mouse X") * Speed  ); //1
        }
    }
}