Check out example codes for "how to change the axis of a Vector3 variable". It will help you in understanding the concepts better.

Code Example 1

Vector3 playerPosition = new Vector3(0, 0, 0); 

void Update()
{
	Input.Getkey("w")
    {
		playerPosition = transform.position;
		playerPosition.x -= 1f;
		transform.position = playerPosition;
    }
}

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