How can I organize Christmas photos by year on a flash drive on iMac?

Kurt Lang wrote: To keep them from being lumped together, you do the exact same thing on the flash drive you would do on your Mac or PC. Create separate folders by year.

… and containing folders for decades, so you don't have to look through hundreds (because I have lots of old family pictures) of folders to sort through to find the one you want.

By the way, flash drives are slow and buggy. They're fine for transferring files, but I'd never depend on them for keeping important stuff. You should get a nice Solid State hard drive. If it's only to be used on Macs, then you should format it as APFS.

To keep them from being lumped together, you do the exact same thing on the flash drive you would do on your Mac or PC. Create separate folders by year.

Where are these photos now? Are they in the Photos app? Or are they just in a folder on your Mac?

(I am old to be your grandfather, that's why I need simple definitions ).

Given that my grandfather was born in 1880, I doubt that. Many of the folks who spend a lot of time on this forum have been eligible for Medicare for a while now. So, rest assured, older people can learn how to use the technology!

By the way, flash drives are slow and buggy. They're fine for transferring files, but I'd never depend on them for keeping important stuff.

Absolutely. I would never trust a flash drive for permanent storage. The price per GB of a flash drive as opposed to an SSD is much less because they're cheap, throwaway hardware. i.e., not dependable.

I keep at least two copies of everything. One on a NAS, and the other on an external SSD formatted as APFS.

IdrisSeabright wrote: Given that my grandfather was born in 1880,

I knew I was one of the young ones-- my grandfather was born in 1882.