If you use Linux most mainstream distros allow you to encrypt your hard drive during OS installation using LUKS. You can also use Gnome Disk Utility to encrypt an external hard drive (using LUKS).
Veracrypt is cross platform but personally I use LUKS since it is integrated into the OS.
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I’m gonna be the voice of reason and tell you that this question doesn’t fit here. Try Google or GPT4.
If you use Linux most mainstream distros allow you to encrypt your hard drive during OS installation using LUKS. You can also use Gnome Disk Utility to encrypt an external hard drive (using LUKS).
Veracrypt is cross platform but personally I use LUKS since it is integrated into the OS.
Here is a guide explaining more: https://tails.net/doc/encryption_and_privacy/encrypted_volumes/index.en.html