# Arelvox > Build. Learn. Understand Technology. > Generated by All in One SEO v5.0.3, this is an llms.txt file, used by LLMs to index the site. ## Sitemaps - [XML Sitemap](https://arelvox.com/sitemap.xml): Contains all public & indexable URLs for this website. ## Posts - [Articles](https://arelvox.com/articles/) - [KB5127648: Windows 11 October 2026 Update Problems, Fixes and 24H2 End of Support](https://arelvox.com/kb5127648-windows-11-october-2026-update/): KB5127648 is the Windows 11 October 2026 update. See what it fixes, known issues like Smart App Control grayed out, and why 24H2 Home and Pro must upgrade. - [PHP2Shell (CVE-2026-109618 & CVE-2026-109619): Are You Affected and How to Patch](https://arelvox.com/php2shell-cve-2026-109618-cve-2026-109619/): PHP2Shell (CVE-2026-109618 and CVE-2026-109619) lets attackers run code on PHP servers. See affected versions, how to check your PHP version and how to patch. - [How to Automate Tasks on Linux with Cron Jobs: A Beginner's Guide](https://arelvox.com/how-to-automate-tasks-on-linux-with-cron-jobs-a-beginners-guide/): Learn how to automate tasks on Linux with cron jobs. A beginner's guide with simple examples, syntax explained and common mistakes to avoid. - [Getting Started with Arduino: Your First Electronics Project](https://arelvox.com/arduino-for-beginners-first-project/): Arduino for beginners: set up the IDE, wire your first circuit, and blink an LED to learn the fundamentals of electronics and code. - [What Is a Large Language Model? Explained Simply](https://arelvox.com/what-is-a-large-language-model/): What is a large language model? Learn how LLMs work, how they are trained, what they can do and where they fail, explained simply for beginners. - [How to Set Up Pi-hole on a Raspberry Pi to Block Ads](https://arelvox.com/pi-hole-raspberry-pi-block-ads/): Learn how to set up Pi-hole on a Raspberry Pi and block ads and trackers on every device in your home network. Step-by-step guide for beginners. - [NVMe vs SATA SSD: Which One Should You Buy?](https://arelvox.com/nvme-vs-sata-ssd/): NVMe vs SATA SSD explained simply: speed, price, compatibility and real-world performance, so you can pick the right drive for your PC or laptop. - [How to Check Open Ports on Linux: A Beginner’s Guide](https://arelvox.com/how-to-check-open-ports-linux/): Learn how to check open ports on Linux with ss, lsof, and nmap. A beginner-friendly guide to finding listening services and closing the ones you don't need. - [The Ultimate Guide to Your Home Network: IPs, Routers, and DNS](https://arelvox.com/the-ultimate-guide-to-your-home-network-ips-routers-and-dns/): A plain-language guide to home network basics — IP addresses, routers, and DNS explained for troubleshooting and everyday use. - [Essential Linux Commands Every Beginner Should Know](https://arelvox.com/essential-linux-commands-every-beginner-should-know/): A practical, beginner-friendly reference to the essential Linux terminal commands — file navigation, permissions, package management, and networking basics. - [How to Secure Your Home Network: A Practical Cybersecurity Guide for Beginners](https://arelvox.com/how-to-secure-your-home-network-a-practical-cybersecurity-guide-for-beginners/): A practical, beginner-friendly guide to securing your home network — from router passwords and Wi-Fi encryption to firmware updates and guest networks. - [How to Turn a Raspberry Pi Into a Home Server (Beginner Guide)](https://arelvox.com/turn-a-raspberry-pi-into-a-home-server-a-beginners-step-by-step-guide/): A beginner-friendly guide to turning a Raspberry Pi into a home server — from installing the OS to running your first services like Pi-hole, Samba, or Jellyfin. - [How to Calculate Subnets by Hand: A Step-by-Step Guide](https://arelvox.com/how-to-calculate-subnets/): Learn how to calculate subnets by hand with the magic number method. Find the network, broadcast and host range of any IPv4 address, with examples. ## Pages - [Home](https://arelvox.com/): Practical guides, tutorials and projects on programming, Linux, cybersecurity, networking, AI and modern technology. - [Free Browser Games](https://arelvox.com/games/): Play free browser games online: a stacking game, a daily number puzzle, a typing game and an idle clicker. No download, no sign-up, works on phones. - [Sky Stack: Free Stacking Game](https://arelvox.com/sky-stack/): Play Sky Stack, a free stacking game in your browser. Tap to drop the blocks, chain perfect drops for combos and build the tallest tower. Works on phones. - [Root Access: Hacker Idle Game](https://arelvox.com/hacker-idle-game/): Play Root Access, a free hacker idle game in your browser. Hack for data, deploy programs, unlock upgrades and go dark for reputation. No download, no sign-up. - [Bug Hunt: Free Typing Game](https://arelvox.com/bug-hunt-typing-game/): Play Bug Hunt, a free typing game in your browser. Squash falling bugs by typing programming words, beat your high score and improve your typing speed. - [Crack the Code: Daily Number Puzzle](https://arelvox.com/crack-the-code/): Crack the Code is a free daily number puzzle. Guess the secret code with color clues, then race the clock in Time Attack with combos and power-ups. - [Free Online Tools](https://arelvox.com/tools/): Free online tools for networking, Linux, electronics and developers: subnet calculator, chmod, cron generator, Ohm's law, Base64 and more. No sign-up. - [Projects](https://arelvox.com/projects/): Hands-on projects and free tools built and documented by Arelvox. Everything runs in your browser, with no sign-up. More Raspberry Pi builds, automation scripts and hardware experiments are on the way. Game · NewSky Stack: Stacking GameOne tap to drop each block. Chain perfect drops and build the tallest tower. Works great on phones.Play now - [Voltage Divider Calculator](https://arelvox.com/voltage-divider-calculator/): Free voltage divider calculator: find the output voltage from two resistors, or the R2 you need for a target voltage, with standard values, current and power. - [Download Time Calculator](https://arelvox.com/download-time-calculator/): Free download time calculator: enter the file size and your internet speed to see how long a download will take, with real-world overhead and common speeds. - [Unix Timestamp Converter](https://arelvox.com/unix-timestamp-converter/): Free Unix timestamp converter: turn epoch time into a readable date in your time zone or UTC, convert any date back to a timestamp, and see the current time. - [Chmod Calculator: Free Linux File Permissions Tool](https://arelvox.com/chmod-calculator/): Free chmod calculator for Linux. Convert file permissions between numbers like 755 and symbols like rwxr-xr-x, and copy the ready-made chmod command. - [Base64 Encoder and Decoder](https://arelvox.com/base64-encoder-decoder/): Free online Base64 encoder and decoder. Encode or decode text instantly, with UTF-8, URL-safe Base64 and file to data URI support. Runs in your browser. - [Secure Password Generator](https://arelvox.com/password-generator/): Free secure password generator: create strong random passwords or easy-to-type passphrases in your browser, with a strength meter. Nothing is sent or stored. - [Cron Expression Generator](https://arelvox.com/cron-expression-generator/): Free cron expression generator: build crontab schedules without memorizing the syntax, explain any expression in plain English and see the next run times. - [LED Resistor Calculator](https://arelvox.com/led-resistor-calculator/): Free LED resistor calculator for Arduino, Raspberry Pi and any power supply. Get the exact and standard resistor value, power rating and color bands. - [Ohm's Law Calculator](https://arelvox.com/ohms-law-calculator/): Free Ohm's law calculator: enter any two of voltage, current, resistance or power and instantly get the other two, with the formulas shown step by step. - [Linux Command Generator: Build Terminal Commands Easily](https://arelvox.com/linux-command-generator/): Free Linux command generator: pick a task, fill in a few fields and copy the exact terminal command, with every option explained in plain English. - [Resistor Color Code Calculator: 4 and 5 Band Values](https://arelvox.com/resistor-color-code-calculator/): Free resistor color code calculator for 4-band and 5-band resistors. Pick the colors to get ohms and tolerance, or type a value to see its color bands. - [Subnet Calculator: Free IPv4 Network and Host Range Tool](https://arelvox.com/subnet-calculator/): Free subnet calculator for IPv4. Enter any IP and prefix to get the network, broadcast address, usable host range, subnet mask and wildcard mask instantly. - [About](https://arelvox.com/about/): Arelvox is a technology publication with practical, hands-on guides on programming, Linux, cybersecurity, Raspberry Pi, networking, and more. - [Cookie Policy](https://arelvox.com/cookie-policy/): This Cookie Policy explains how Arelvox uses cookies and similar technologies on arelvox.com. - [Privacy Policy](https://arelvox.com/privacy-policy/): This Privacy Policy describes how Arelvox collects, uses, and protects information when you visit arelvox.com. - [Contact](https://arelvox.com/contact/): Have a question, a suggestion for a future article, or spotted something that needs fixing? We'd love to hear from you. - [Legal Notice](https://arelvox.com/legal-notice/) ## Categories - [Programming](https://arelvox.com/category/programming/): Beginner-friendly programming guides, Git tutorials and developer tools explained step by step, with real examples you can copy and run. - [Linux](https://arelvox.com/category/linux/): Practical Linux tutorials: terminal commands, file permissions, cron jobs and server basics, tested on real systems and explained without jargon. - [Networking](https://arelvox.com/category/networking/): Home and small-office networking explained: IP addresses, subnets, routers and DNS, plus free tools like our IPv4 subnet calculator. - [Cybersecurity](https://arelvox.com/category/cybersecurity/): Simple, practical security guides to protect your home network, devices and accounts, from router settings to ad and tracker blocking. - [Raspberry Pi](https://arelvox.com/category/raspberry-pi/): Raspberry Pi projects and setups: home servers, Pi-hole, file sharing and more, with step-by-step instructions for beginners. - [Electronics](https://arelvox.com/category/electronics/): Hands-on electronics for beginners: Arduino projects, circuits and components, with code and wiring explained step by step. - [Automation](https://arelvox.com/category/automation/): Automate repetitive tasks with scripts, cron jobs and simple workflows on Linux and Raspberry Pi. - [Software](https://arelvox.com/category/software/): Honest guides and insights on useful software for makers, developers and home-lab users. - [AI](https://arelvox.com/category/ai/): Artificial intelligence explained simply: how large language models work, what they can do and where they fail. - [Hardware](https://arelvox.com/category/hardware/): PC and maker hardware guides: storage, components and buying advice explained in plain English.