Get started with using the codesniffer tool in order to ensure your code adheres to the PSR-2 standards.
Install the the ceph-deploy tool for the latest LTS version of Ceph, on the latest version of Debian.
A short guide on creating a GPG master key, before then creating subkeys for it.
Change the mode of your Yubikey so that you can use it for PGP/GPG as well.