I'm all for people trying to learn and improve themselves, but I think it's worth asking the question: what is the use case here? If the goal is to protect individual files, you're probably much better of encrypting them individually or the directory they are contained in. For that, I'd recommend using something like Cryptomator:
If you need to protect the entire drive, then it'd be easier to encrypt the whole drive during the installation of Zorin OS.