Guides
Practical step-by-step tutorials on Windows, server setup, web development, AI integration, and custom software — written by engineers who build production systems every day.
Default SSH configuration is a target for automated brute-force attacks. This guide covers disabling password authentication, changing the default port, setting up SSH key auth, and configuring fail2ban to block attackers.
UFW (Uncomplicated Firewall) is the standard firewall for Ubuntu. This guide covers the essential rules, common configurations for web servers and app servers, and how to manage rules without locking yourself out.
Server downtime costs money and credibility. This guide covers free and low-cost monitoring options — from cron-based health checks to uptime monitoring services — and how to get instant alerts via Telegram, Slack, or email.
Cloudflare sits between your visitors and your server — caching content globally, blocking attacks, and adding SSL. This guide covers setup, cache configuration, page rules, and the security features worth enabling.
SQL injection is the most common web vulnerability and still in the OWASP Top 10. This guide explains how it works, how to find vulnerable code, and how to fix it permanently.
OAuth 2.0 is the protocol behind "Login with Google" and "Connect with GitHub." This guide explains the flows, tokens, and terminology without the jargon — and when to use which grant type.
Storing passwords incorrectly is one of the most common and catastrophic security mistakes. This guide covers what to use (bcrypt/argon2), what never to use (MD5, SHA1, plain SHA-256), and how to implement it correctly.
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