Check out example codes for "rotate player unity". It will help you in understanding the concepts better.

Code Example 1

//This is how you rotate your player left and rigth with the wrrow keys:

public class Test : MonoBehaviour 
	public float RotateSpeed = 30f;
    void Update () 
        if (Input.GetKey(KeyCode.LeftArrow))
            transform.Rotate(-Vector3.up * RotateSpeed * Time.deltaTime);
        else if (Input.GetKey(KeyCode.RightArrow))
            transform.Rotate(Vector3.up * RotateSpeed * Time.deltaTime);

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