Check out example codes for "how to spawn coins randomly around the screen unity 2d". It will help you in understanding the concepts better.

Code Example 1

void Start()
            for (int i = 0; i < 10; i++)
                float spawnY = Random.Range
                    (Camera.main.ScreenToWorldPoint(new Vector2(0, 0)).y, Camera.main.ScreenToWorldPoint(new Vector2(0, Screen.height)).y);
                float spawnX = Random.Range
                    (Camera.main.ScreenToWorldPoint(new Vector2(0, 0)).x, Camera.main.ScreenToWorldPoint(new Vector2(Screen.width, 0)).x);
                Vector2 spawnPosition = new Vector2(spawnX, spawnY);
                Instantiate(banana, spawnPosition, Quaternion.identity);

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