i had this idea that a program can edit files in an encrypted environment. WinRaR with higher level of encryption would be the best way to describe it. but i was wonder if the files on a linux HDD or SDD are encrypted.
I do have this idea that you can save encrypted files to a cloud server and pull it out and unencrypted by a light weight program
Look up docs for cryptsetup which is the simplest way to use it. The Debian installer (and maybe others) can set it up for you automatically as well.