You will likely see .json files alongside photos. These contain metadata (dates, locations, captions) that Google Photos used. How to Extract and View Photos
Once extracted, you may need to merge the contents of the separate folders created by each zip part to have all photos in one place. Photos-001.zip
If you are on a phone, it is often easier to export the photos to Google Drive, then move them to your local device storage. To help you better, could you tell me: You will likely see
Use the "Files" app, locate the zip, and select "Extract". locate the zip