How do I add more users in an SSH server and lock them down to a certain folder? I know probably need to add it in the
/etc/ssh/ file directory but I don't know what to change in there. I'm using OpenSSH on a Linux Mint/Debian build
I'm not sure what you mean by locking down to a folder, but I think you're talking about permissions here.
Here is a great piece describing permissions in Linux and how to manage them.
You can add a new user using this command:
Once the user has been added, you can assign the relevant permissions.