Reply To: Smarter way of re-sizing image

Everyone works in InDesign differently. Your way is not bad or wrong. I like using numbers instead. For example, I would set the Reference Point in the Control panel to the upper-left corner and then set the Y field to the same as the X field. Then I would stretch the bottom of the frame to the very bottom of the page (where it snaps), and finally I would place my cursor in the H field and subtract the value that I see in the X or Y field
https://creativepro.com/indesign-does-math-for-you.php
But there are other ways to do it, too! :-)