Exif data is really fascinating, and exiftool is really worth playing around with for an afternoon. The metadata on color space, focal distance, aperture are all really useful tools for making photos look correct on an arbitrary display surface, and it is pretty fun to swap them out to see the effects on rendering.

As an aside, the location/time data is useful for somethings but also kind of creepy and I really wish there were more privacy considerations in how these pieces of meta data are handled. There was a period where I routinely set these fields to be taken in Pyongyang, North Korea, 100m below sea level and one day in the future.

exiftool -GPSLatitude=39.0738-GPSLatitudeRef=N -GPSLongitude=125.8198 -GPSLongitudeRef=E -GPSAltitude=-6 -GPSAltitudeRef="Below Sea Level" -AllDates="$(date -v +1d '+%Y-%m-%d %H:%M:%S')" FILENAME.jpg

> I really wish there were more privacy considerations in how these pieces of meta data are handled.

When you Export a photo from Apple's Photos, there is a checkbox you can toggle for Location Information. I generally have that unchecked so that it strips that EXIF data from the resulting exported image.