Step-by-step guides with the exact commands you need, and a video walkthrough for most of them.
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Linux & Command Line
Essential commands, grep, file paths and server tools.
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Keys, MFA, locked-out servers and SSL certificates.
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Oracle Cloud
Get the most out of the Always Free tier.
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VPN & Networking
Run your own WireGuard VPN in minutes.
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macOS
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Minecraft, Matrix, Docker and OpenStack.
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Latest tutorials
All tutorials →Post-Quantum TLS on Your Server: How to Check It and Turn It On
How to check whether your server accepts X25519MLKEM768, which OpenSSL version you need, and how to turn it on in nginx and Apache.
SSL Certificates Are Expiring Faster: Every Change Through 2029
SSL certificate lifetimes drop to 200, 100 and then 47 days by 2029, and Let’s Encrypt moves to 45 days. What changes when, and how to stay ahead.
Avoiding SSL Certificate Problems Before They Break Your Site
Why SSL certificates fail (expiry, revocation, hostname mismatch) and how to monitor them automatically so they never break your site or your users’ trust.
Easy VPN Setup with WireGuard Manager
Set up a WireGuard VPN in minutes with wireguard-manager, a free script for Debian and Ubuntu: install, add or remove clients and generate mobile QR codes.
Mastering OpenStack: A Beginner’s Guide Video Series
A 5-part OpenStack video series for beginners: install it on Ubuntu in VirtualBox, launch instances, set up networking and SSH, upload images, use the CLI.
Getting Started with Linux: Understanding Relative and Absolute Paths
Understand absolute and relative paths in Linux with clear examples: what /, ., .. and ~ mean, how to use them with cd and cp, and when to use each one.
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