These fields, called EXIF metadata, are added automatically by the camera and by editing software. Nobody asks your permission, and nothing displays them.
Location
GPS coordinates, place, city, country
Device
Make, model, lens, serial numbers, MakerNotes
Date and time
Capture, modification, time zone
Author
Name, copyright, credit, contact
Identifiers
Unique image ID, face regions
Embedded thumbnail
Preview stored inside the file, sometimes predating the crop
Software
Editing tool, version, edit history
Free text
Title, caption, keywords, comments
Capture settings
Aperture, ISO, focal length, flash, exposure
Colour profile
ICC profile — removing it may shift colours