It's been a hot minute since I've done anything with GnuPG, but I still have the presentation I did some years back on my website. It might help.
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possibly one of the most insufferable tasks on Linux, I've never had luck with it
If you use emacs, you can set up gnupg integration for easy encryption and decryption of files.
I would also read up on expiration of keys, and how you can export (backup) and import a key. The latter can also be useful if you want to use the same key on multiple devices.
If you think it's hard to figure out GPG for yourself, well good luck finding and communicating with someone else who has also figured it out.