Blog about Web Programming and Electronics
The Vadnica Blog is a place where I share my experience with web programming and electronics. Here you will find articles about HTML, CSS, JavaScript, PHP and MySQL, as well as Arduino projects, Linux and news from the world of technology. I write in a simple, understandable language, so the content is accessible to both beginners and more experienced readers.
What is a VPN and How It Protects Your Privacy and Network Connection
Using public Wi-Fi networks in cafes, airports, or hotels carries the risk of adversaries intercepti...
What is IPv4 and IPv6 and Why We Are Transitioning to a New Web Standard
Every device connected to a local network or the internet—whether a smartphone, computer, or smart l...
How SSL Certificates Work and Why HTTPS is Mandatory for Every Website
When browsing the web, you often notice a padlock icon next to the URL and the prefix https:// inste...
How DNS Works and Why It Is Called the Phonebook of the Internet
When you enter a website address into your browser (e.g., google.com), computers and routers do not ...
How Virtualization Works and Why It Is Essential for Modern Servers
In the past, a single physical server typically ran only one operating system and application, leadi...
How Searching Files in Linux with the grep Command Simplifies Developer Workflows
When working with web servers, inspecting log files, or reviewing source code, developers frequently...
Most Useful PowerShell Commands for Managing Windows Systems
Windows PowerShell is an extremely powerful tool for automation and managing the Windows operating s...
Basic Linux Commands for Beginners Every Developer Should Know
Working with the Linux operating system is a key skill in modern web development, server management,...
How to Build a Simple PHP Backend for Web Applications
Every modern web application or store requires a backend responsible for secure data processing, dat...
What is WebSocket and How It Enables Real-Time Communication
The classic HTTP protocol relies on a request-response model: the client (browser) must always initi...
What is a REST API and How It Connects Applications
In modern web development, the data layer (backend) and the user interface (frontend or mobile appli...
How AJAX Works and Why It Is Essential for Modern Websites
In the early days of web development, every user interaction—such as submitting a form or clicking t...