Course catalogue

From Linux fundamentals to running production servers.

• Beginner

  Your first server

  What a server is, how to connect to one for the first time, and how to keep it updated without breaking it.

  7 lessons · 136 minutes

• Beginner

  Linux Fundamentals

  First steps in a Linux terminal: finding your way around the filesystem, reading files, and understanding permissions.

  11 lessons · 193 minutes

• Intermediate

  Managing services with systemd

  Start, stop and diagnose services on an Ubuntu server, and write a unit for your own application.

  9 lessons · 168 minutes

• Intermediate

  Users, sudo and SSH access

  Create accounts, grant privileges with sudo, and secure SSH with keys — without ever locking yourself out.

  10 lessons · 217 minutes

• Beginner

  How a network works: packets, addresses and neighbours

  What actually travels between two machines, and how each one decides whether the destination is a neighbour or somebody else's problem.

  6 lessons · 126 minutes

• Beginner

  Ports, TCP and UDP: how two programs talk

  An address names a machine, a port names a program — and a connection is nothing more than two kernels agreeing.

  5 lessons · 104 minutes

• Intermediate

  Configuring the network: an address that survives a reboot

  Assigning what the earlier courses taught you to read: addresses, routes, MTU, bridges, bonds and translation rules — and making them persist.

  11 lessons · 222 minutes

• Intermediate

  Networking: how your server is reached

  Addresses, ports and connections: name the failing layer instead of declaring "the network is down".

  6 lessons · 127 minutes

• Advanced

  Hosting a web application with Nginx

  Serve a React/Vite build, put a Node.js or Next.js application behind a reverse proxy, and move to HTTPS.

  10 lessons · 222 minutes

• Advanced

  ISPConfig: hosting several sites on one server

  Install the ISPConfig panel on Ubuntu Server, understand what it automates, and host a site and then a Node.js application on it.

  5 lessons · 140 minutes

• Intermediate

  Bash scripting for administrators

  Automate administrative tasks without writing a script that fails silently or destroys data through an empty variable.

  6 lessons · 144 minutes

• Intermediate

  Backups and restores

  Back up a database and files, apply retention, and above all verify that a restore works before you need it.

  6 lessons · 149 minutes

• Intermediate

  Firewall and hardening

  Close what has no business being open, slow automated attacks down, and check regularly what the server exposes — without locking yourself out.

  9 lessons · 220 minutes

• Intermediate

  Monitoring a server

  Read disk, memory and load correctly, control log growth, and find out before your users do.

  7 lessons · 168 minutes

• Intermediate

  DNS: pointing a domain at your server

  Understand how a name resolves, publish the right records, and diagnose with dig instead of waiting.

  6 lessons · 138 minutes

• Intermediate

  Diagnosing a failure: what each output proves

  Read what each output actually proves, narrow an unknown failure down to one component, and fix it without destroying the evidence that explained it.

  8 lessons · 172 minutes

• Intermediate

  Docker: containers for hosting a Node application

  What a container actually is, when to do without one, and how to put a Node application and its database behind a reverse proxy without exposing the machine.

  9 lessons · 190 minutes

• Intermediate

  Deploying: releases, the switch and rolling back

  Get the code onto the server, switch in a single operation, and be able to go back — including when the verification fails.

  6 lessons · 138 minutes

• Advanced

  Administering PostgreSQL: access, connections and growth

  Who may connect, how many at once, what the database is doing right now, and why it takes more space than the data inside it.

  10 lessons · 232 minutes

• Intermediate

  Git for administrators: a history you can trust

  Answer "what changed?" with a command instead of a memory: commits, history, remotes and release tags.

  7 lessons · 149 minutes

• Intermediate

  Ansible for one server: a description you can run

  Describe the machine's state in a playbook, run it until changed=0, and know what a green run does and does not prove.

  6 lessons · 127 minutes

• Advanced

  The capstone: from repository to production

  The whole curriculum on one machine: build a production service, break it, restore it, and prove it holds.

  4 lessons · 97 minutes