Check out example codes for "rotation unity script 2d". It will help you in understanding the concepts better.

Code Example 1

transform.eulerAngles = Vector3.forward * degrees;
// or
transform.rotation = Quaternion.Euler(Vector3.forward * degrees);
// or
transform.rotation = Quaternion.LookRotation(Vector3.forward, yAxisDirection);
// or
transform.LookAt(Vector3.forward, yAxisDirection);
// or
transform.right = xAxisDirection;
// or
transform.up = yAxisDirection;

Code Example 2

transform.Rotate(Vector3(0, 0, 50));
//instead of :
transform.eulerAngles = new Vector3 (0, 0, 50);
//or like you said
transform.eulerAngles = Vector3.forward * 50;

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