Veracrypt is the best graphical encryption program in Linux. Using Veracrypt you can encrypt a hard drive, separate partitions or simply create an encrypted file container.
You can also encrypt a partition in Linux and make it hidden, so no one will even know that you are hiding something.
Veracrypt is based on Truecrypt. I have been a user of Truecrypt only for my encryption but when it became insecure I switch to standard Linux encryption tools (command line) https://youtu.be/ch-wzDyo-wU
I still prefer LUKS encrypotion for hard drives, and use Veracrypt only for encrypted containers.
All videos about Encryption Tools in Linux https://www.youtube.com/playlist?list=PLSmXPSsgkZLs7eIWJAiEDqehgDaZItim_
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