Check out example codes for "how to change rotate with script unity". It will help you in understanding the concepts better.
Code Example 1
var rotationVector = transform.rotation.eulerAngles; rotationVector.z = 0; //this number is the degree of rotation around Z Axis transform.rotation = Quaternion.Euler(rotationVector); //if you put this in a coroutine and yielding for some amount of time //you can have something like a rotating loading icon
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