Expert guides, tutorials, and best practices for using online tools effectively and securely. Written by Ing. Peter Divéky.
Free online tools can save hours of work—or compromise your security and steal your data. Learn how to identify trustworthy tools and protect yourself from malicious websites, data harvesting, malware, and phishing scams. Comprehensive safety checklist included.
Learn how hackers crack passwords using brute force, dictionary attacks, and credential stuffing. Discover proven strategies to create unbreakable passwords, evaluate top password managers (Bitwarden, 1Password, Dashlane, KeePassXC), and implement multi-factor authentication effectively.
Master text formatting techniques that boost search engine rankings and user engagement. Learn proper heading hierarchy, paragraph structure, list formatting, character counts for different platforms, mobile optimization, structured data implementation, and accessibility requirements.
Comprehensive guide to QR codes covering technology fundamentals, practical applications for business and marketing, creation best practices, size requirements, error correction levels, design customization, security considerations, and future trends.
Master unit conversions across length, weight, temperature, volume, area, speed, pressure, and energy. Includes conversion formulas, common conversions, practical examples, metric vs imperial systems, scientific notation, and tips for avoiding conversion errors.
I used the same password for everything for six years. After a breach exposed my credentials, I finally switched to a password manager. Here's what actually changed my mind, what I learned during setup, and which options work for normal people.
Instagram, X, LinkedIn, YouTube, TikTok — every platform has its own rules about how much you can write, and they're often invisible until you hit them. A practical breakdown of what you're working with on each major platform, and why the limits aren't always arbitrary.
Kilometer vs mile speed limits, Celsius vs Fahrenheit weather, kilos vs pounds at the airport scale. The conversions that come up most when crossing between metric and imperial countries, with mental shortcuts for each.
Almost every country uses metric. The US has tried to switch twice and failed both times. Here's the actual history of why, what the costs of that failure have been, and whether it's ever likely to change.
Two-factor authentication stops most account takeovers even when your password is stolen. Here is what it actually does, the difference between SMS codes and authenticator apps, and which accounts to protect first.
You don't need to become a privacy expert to meaningfully reduce how much data companies collect about you. Start with browser settings, app permissions, and search engines — steps that take minutes and make a real difference.
Contactless menus finally made QR scanning a normal habit. Now that people actually scan them, here are the small business uses that genuinely earn their place — from review requests to WiFi logins — and the ones that don't.
Fake sites now have valid SSL certificates, professional design, and working contact forms. The checks that actually matter are different from what most people think — starting with how to read a URL properly.
Students spend money on software that has free alternatives. A practical list of tools that actually work for writing, file conversion, citations, diagrams, and staying organised — plus the ones that sound useful and aren't.
For most passwords, use a manager. But for your master password and device logins, you need something genuinely strong that you can recall without writing it down. The diceware / passphrase approach and where the classic advice goes wrong.
All tools are free, require no signup, and respect your privacy