A basic question - resizing a photo

kenb78284178  wrote At times, when I post a picture to facebook, the image is to big, and part of the picture cannot be seen. I should know the answer, but I don't. Appreciate advice. Ken

This article has guidance for the pictures that can be posted on Facebook in various locations.

https://havecamerawilltravel.com/photographer/images-photos-facebook-sizes-dimensions-types/ .

Once you have determined what is relevant for your purpose, in PSE Editor, expert tab, go to File>Save for web. Enter the appropriate pixel dimensions and file type in the dialog. Be sure that "Constrain Proportions" is checked.