find / -lname '/path/you/are/looking/for/*'

Note that the -lname option is a GNU find extension and may not work with other find implementations.

It asks for a path to a root directory of a bootstraped container. You can create it with debootstrap, rinse, pacstrap, alpine-chroot-install, virt-bootstrap etc.

virt-manager is able to work wit lxc. Add a new connection of type Libvirt-LXC.

Yes, you can.

Nope. Free beer ≠ free speech.

Not built-in. It uses gdb or lldb or another standalone debugger.

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Try ddd. Also IDEs usually can be integrated with gdb and other popular debuggers.

#!/bin/sh
printf 'ABC %s: ' "$(date --rfc-3339=date)" | xclip

Do you really need OPNsense? Buying a OpenWrt capable router would save your money, place and silence.

There are perfect guidelines on preparing translatable strings in the GNU gettext documentation.

Try to avoid using any file manager (uninstall them all if it is difficult to avoid running them). So you will practice in using file manipulation commands.