Articles & Guides
Useful resources for web developers and system administrators
Networking
Static vs Dynamic IP Address: What They Are and How to Check Yours
How a static IP differs from a dynamic one, how to tell a public address from CGNAT, how to check which one you have and what to do if a static IP is unavailable.
Security
JWT token explained: structure, decoding, and verification
JWT token explained: header.payload.signature structure, how to decode a JWT locally or online, why decoding is not verification, classic mistakes and attacks.
Performance
HAR file: what it is, how to record one, and how not to hand over your session
HAR file: what it is, how to record one in Chrome, Firefox, Edge and Safari, what sensitive data it holds, and how to scrub cookies and tokens before sending it.
Networking
Subnet Mask Explained: the /8–/32 Table and How to Calculate It Without a Tool
What a subnet mask is and how to read /24 and 255.255.255.0: a mask table with host counts, network and broadcast calculation, reserved ranges and where it matters.
Security
Advertising Disclosure on Your Website: What Counts as an Ad, Where the erid Token Comes From, and How It Breaks Technically
What counts as advertising on a website, who is responsible for the label, where the erid token goes, and which technical mistakes leave a live page unlabelled.
Monitoring
Yandex Metrica and Session Recording: Setup, Goals, Why Recordings Are Missing, and the Privacy Trap
How to set up the Metrica counter and session recording: where the code goes, why recordings and goals fail, the effect on page speed, and the privacy obligations.
Domains
How to Connect a Custom Domain to Tilda and Other Website Builders: A Records, SSL and Common Mistakes
How to point your own domain at a website builder: which A and CNAME records you need, why the SSL certificate is not issued, what happens to email, and how to verify.
Infrastructure
The .htaccess File: Where It Lives, How It Works, and How to Configure Redirects, Access and Caching
What .htaccess is, where the file lives and how it works: directive syntax, HTTPS and www redirects, IP and password access, caching headers and 500 error fixes.
Infrastructure
Website Backup Guide: What to Copy, Where to Store It, How to Verify Restores
A complete website backup: files, database, configs, cron and certificates. The 3-2-1 rule, RPO and RTO, mysqldump flags, encryption, restic and restore testing.
Infrastructure
VPS Initial Setup Checklist: The First 30 Minutes Before You Deploy
Step-by-step VPS setup: LTS choice, sudo user, SSH keys, ufw and fail2ban, updates, swap, time sync, limits. Real commands and how to verify each step.