There’s 2 simple ways to search Google for an image:

1. In Google Chrome, right click on the image and choose “Search Google for Image”

2. For photos saved on your computer, open to Google images (https://www.google.com/imghp) & just drag & drop your photo into the search box

You’ll see Google’s best guess as to the contents of the photo, visually similar images and pages that include matching images.