To crop and resize an image on Windows using the Photos app, follow the steps below.
Crop:
Open the image you wish to crop in the Microsoft Photos app
Once it's opened, click the Crop icon in the centre of the top bar which will open your image in the cropping view
Drag the corners to remove the part of the image you want to remove
In the bottom right click Save
Resize:
Open the image you wish to resize in the Microsoft Photos app
Click three dots in the top-right corner, then click Resize
A small pop-up will appear. Click Define custom dimensions at the bottom
Untick Maintain aspect ratio and set your new dimensions
Click Save resized copy
The video below shows you how:
The final image will then be cropped and resized to your satisfaction.
