Q. How do I insert an image into a Google Slides presentation?

The first thing you'll want to do is to save the image if it is not saved already.  You can do this from within the browser by right clicking the image and selecting "Save Image As."  Different browsers use different wordings, but they all sound similar.

Once the image is saved, go to your Google Docs/Google Slides file.  There is an image button on the toolbar.  It looks like a picture frame.  Press that button and go to upload image.  Upload the image you want to use and then select it.  That will place your image in your file.