When my camera rotates, character rotates but also slightly moves causing camera space out of body

Questions & Answers
1

I have very simple camera movement script:
public class playerCam : MonoBehaviour
{
public float sensX;
public float sensY;
public Transform orientation;
public Transform camHolder;

    public float xRotation;
    public float yRotation;

    private void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    private void Update()
    {
        // get mouse input
        float mouseX = Input.GetAxisRaw("Mouse X") * Time.fixedDeltaTime * sensX;
        float mouseY = Input.GetAxisRaw("Mouse Y") * Time.fixedDeltaTime * sensY;

        yRotation += mouseX;
        xRotation -= mouseY;
        xRotation = Mathf.Clamp(xRotation, -90f, 90f);

        // rotate cam and orientation
        transform.rotation = Quaternion.Euler(xRotation, yRotation, 0);
        orientation.rotation = Quaternion.Euler(0, yRotation, 0);
    }
}

and then in my movement script in void update, I have this line:

transform.rotation = Quaternion.Euler(0, Camera.eulerAngles.y, 0);

Camera rotates body perfectly, but while the body rotates, it also very slightly moves, causing this effect of camera popping in and out of body, essentially not standing in same place
203980-ezgif-3-234468410e.gif

I am struggling to figure out why

2

Working with quaternion is challenging. Why don’t you use Cinemachine?