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Ubuntu Server Edition

Ubuntu versions
Available support
LTS and non-LTS releases
Maintenance policy and life cycle
Package Management

Dpkg and apt
Available sources
Adding new sources
Aptitude
Automatic Updates
Distribution Upgrades
Networking

Network Configuration
TCP/IP, IPv4 and IPv6
Dynamic Host Configuration Protocol (DHCP)
Remote Administration

OpenSSH Server
OpenLDAP Server
Domain Name Service (DNS)

Configuration
Security

User Management
Console Security
Firewall
AppArmor
Certificates and ways to obtain them (letsencrypt, dehydrated, commercial)
Useful OpenSSL commands
Web Servers and Web Applications

HTTPD - Apache2 Web Server
Setting up a reverse proxy
Modifying an Application to Work Behind a Reverse Proxy
PHP7 - Scripting Language
Node.JS
Python
Databases

MariaDB
Wiki Applications

MediaWiki
Email Services

Postfix
Dovecot Server
Mail Filtering
Version Control System

Subversion
GIT
Backups

Shell Scripts
Archive Rotation
Bacula
Virtualization and Cloud Computing

Qemu and KVM
EC2
Other

Keeping /etc under Version Control System
Setting up RAID
Monitoring with Munin