how to set a rotation in unity code example

Example 1: how to just aet z rotation on transform unity

transform.rotation = Quaternion.Euler(0, 90, 0);

Example 2: unity how to change rotation

transform.eulerAngles = new Vector3(0f, 180f, 0f); //rotates 180 degrees

Example 3: how to chagne rotation in unity

transform.eulerAngles = new Vector3(0f, 180f, 0f); // rotates 180 degrees