Learn infrastructure from the ground up
Clear, practical lessons on domains, hosting, networking and cybersecurity, written by a team that runs these systems every day.
- 4
- Tracks
- 12
- Courses
- 36
- Lessons
Domains & DNS
How names on the internet work, from registration to the records that route email and traffic.
- Beginner
Domain names explained
What a domain actually is, how DNS turns a name into a server address, and the records every site owner should understand.
3 lessons6 min - Intermediate
Business email on your own domain
Point your domain's email to a provider, publish SPF, DKIM and DMARC correctly, and read the reports that tell you who sends as you.
3 lessons5 min - Advanced
Running DNS like an operator
Move DNS without downtime, protect it with DNSSEC, and debug resolution problems the way operators do.
3 lessons6 min
Web Hosting
What hosting really is, how a page gets served, and how to choose and run it well.
- Beginner
Web hosting fundamentals
The types of hosting and when each fits, what happens on the server when a page loads, and how to run a site safely.
3 lessons6 min - Intermediate
Getting started with a VPS
From the first SSH login to a working web stack: secure the server, install Nginx, PHP and a database, and keep it patched.
3 lessons3 min - Advanced
Performance and scaling
Find what makes a site slow, cache at every layer, and grow from one server to several without a rewrite.
3 lessons5 min
Networking
IP addressing, ports and protocols, and the tools engineers use to find problems.
- Beginner
Networking essentials
IP addresses and subnets, how TCP, UDP and ports fit together, and the command-line tools for diagnosing connections.
3 lessons6 min - Intermediate
Practical subnetting and VLANs
Calculate subnets quickly, plan an address scheme for an office or data centre, and separate traffic with VLANs.
3 lessons4 min - Advanced
Routing and how the internet connects
How routers choose paths, how networks exchange routes with BGP, and how to read a traceroute properly.
3 lessons5 min
Cybersecurity
The threats websites actually face and the practical defences that stop them.
- Beginner
Security basics for website owners
The attacks websites really face, how to lock down logins, and what HTTPS and security headers protect against.
3 lessons6 min - Intermediate
Hardening a Linux server
Reduce what an attacker can reach: lock down SSH, close unused ports, block brute force and keep software patched.
3 lessons3 min - Advanced
Backups and incident response
Build backups that survive ransomware, know what to do in the first hour of a breach, and recover cleanly.
3 lessons6 min
Exams and certificates are coming
Soon you'll be able to sign up, sit an exam and earn an IDX certificate. Start learning now.