Debian GNU/Linux

Download Debian: https://www.debian.org/ - There is a small network install disks, full 3-set DVD package, live CD, and a version with non-free firmware included.

Installing Debian in VirtualBox: https://www.youtube.com/watch?v=k1064Cjs-z0

Collection of tips

Recommended packages

Packaging for Debian (.deb/dpkg)

Create system user

Cron jobs

Systemd service files

Setup TLS certificates