Cybersecurity 8 min

How social engineering cost Marks & Spencer £300 Million

Hackers from the Scattered Spider collective tricked Marks & Spencer staff into a password reset. Two months later, the 141-year-old retailer lost £300 million, was offline for 46 days, and had millions of customers’ data stolen in a ransomware attack that started with a single phone call.

David B.

February 26, 2026

Cybersecurity 9 min

The Backdoor (CVE-2024-3094): 500ms Delay that Saved the Internet From Disaster

A state-sponsored attacker spent years infiltrating the XZ Utils project and planted a backdoor targeting OpenSSH on major Linux distributions. Fedora, Debian, and Ubuntu nearly shipped it before it was caught.

David B.

February 26, 2026

Databases 5 min

PostgreSQL Normalization: The Easy Way vs. The Correct Way (1NF, 2NF, 3NF)

Most people design databases the "Easy Way" until they break. Learn the three simple steps to "The Correct Way" and see why Postgres is the king of multi-user speed.

David B.

February 23, 2026

Databases February 19, 2026

SQLite in Depth: Concurrency & Locked Error

SQLite is a powerful, lightweight, and serverless relational database management system (RDBMS) widely used for small to mid-scale projects. Its main strengths lie in its ease of use, minimal configuration, and zero maintenance in most cases.

Ali Eren Tabak

7 min 82

Networking February 10, 2026

How to Restore True Visitor IPs Behind Cloudflare Using NGINX and cf‑nginx (2026)

Automatically get real visitor IPs behind Cloudflare with cf-nginx. Fix analytics, rate limiting, and geolocation without manual updates or code changes.

David B.

9 min 175

Networking February 7, 2026

Understanding Network Layers: Complete Guide to OSI and TCP/IP Models (2026)

Complete guide to the OSI and TCP/IP network models. Learn all 7 layers, protocols (HTTP, FTP, SSH, DNS), Wi-Fi standards (802.11ax, Wi-Fi 6, WPA3), and how data flows through networks.

David B.

14 min 112

Networking February 7, 2026

Networking Infrastructure: The Complete Guide From Topologies to Security (2026)

Learn networking topologies, IPv4 vs IPv6, load balancing, firewalls, VLANs, security protocols, and Quality of Service optimization for better network performance.

David B.

12 min 125

Sysadmin February 6, 2026

Automated Ubuntu VM Creation on Proxmox via Cloud-Init (2026)

This Proxmox bash script automates the entire cloud-init VM workflow, prompts for your settings, downloads the Ubuntu cloud image, configures networking and users, and boots a ready-to-use VM in under a minute.

David B.

6 min 106

Development February 6, 2026

Python Virtual Environments (venv) on Windows and Linux (2026)

Learn how to create and use Python virtual environments to isolate project dependencies, manage packages safely, and avoid conflicts on Linux, macOS, and Windows.

David B.

2 min 93

Cybersecurity February 6, 2026

How to Secure SSH on Debian 11 & 12 with User Creation and Fail2Ban (2026)

Learn how to secure SSH on Debian 11 & 12 by creating a non-root user, enforcing key-based authentication, disabling passwords, and using Fail2Ban to block brute-force attacks.

David B.

3 min 93

Networking February 6, 2026

How to Set Up an Isolated VM Network in Proxmox with NAT (Step-by-Step) (2026)

Learn how to set up NAT in Proxmox to give VMs internet access while blocking them from your LAN. No router config needed. Step-by-step with nftables.

David B.

5 min 104

Sysadmin February 6, 2026

How to Configure Locales on Debian (Fix Language and Encoding Issues)

Locale warnings and encoding errors are common on fresh Debian installs. This guide walks through configuring locales properly so your system handles languages and character sets without issues.

David B.

4 min 101

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Cybersecurity 8 min