Welcome
katipul
For best quality, resize before you move:
Image / Image Size ...
Other option: after move, select in the menu
Edit / Free Transform or press
Ctrl+T (Command + T on the Mac).
Then use the option bar (see attachment) to adjust size. In case you use W and H (Width and Height), make sure you have the link symbol selected in that same option bar (between W and H) to keep the current aspect ratio. At one point you'll see the corner points of the image, which can be moved with your mouse to resize the image too, if you do that make sure you hold down the shift key, again to keep the current aspect ratio.