Check out example codes for "unity get mouse position". It will help you in understanding the concepts better.

Code Example 1

Vector3 worldPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

Code Example 2

Vector2 mousePosition = new Vector2(Input.mousePosition.x, Input.mousePosition.y);

Code Example 3

<p>Click in the div element below to get the x (horizontal) and y (vertical) coordinates of the mouse pointer, when it is clicked.</p>

<div onclick="showCoords(event)"><p id="demo"></p></div>

<p><strong>Tip:</strong> Try to click different places in the div.</p>

<script>
function showCoords(event) {
  var cX = event.clientX;
  var sX = event.screenX;
  var cY = event.clientY;
  var sY = event.screenY;
  var coords1 = "client - X: " + cX + ", Y coords: " + cY;
  var coords2 = "screen - X: " + sX + ", Y coords: " + sY;
  document.getElementById("demo").innerHTML = coords1 + "<br>" + coords2;
}
</script>

Code Example 4

Input.mousePosition

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