It's FOSS published a beginners guide about using GPG to encrypt and decrypt Files on Linux.
Using GPG to Encrypt and Decrypt Files on Linux [Hands-on for Beginners]
A basic hands-on tutorial that shows you how to get started with encrypting and decrypting files with GPG in Linux.
Using GPG to Encrypt and Decrypt Files on Linux [Hands-on for Beginners] - It's FOSS