Guides worth opening
Twenty pieces per page. The top half is what people actually open. Under that, the newest writing. Free tools live at /tools if you need a lookup, not a long read.
Most read
File permissions: the Unix lesson that still saves laptops
Owner, group, everyone else. Why 777 is panic, and why you should not live as Administrator.
1 clickCookies, sessions, and how a site remembers you
The web has no memory. The small note in your browser is the login. Treat it like a key.
1 clickCGNAT and mobile IPs: why your phone shares a public address
Carrier grade NAT, shared IPv4, and how WiFi vs LTE changes what sites see.
1 clickIPv4 vs IPv6: what your public IP is actually showing
The short number and the long one, why both show up on IP lookup, and how IPv6 leaks a VPN.
1 clickWhat to do after a data breach
Change the right passwords, turn on 2FA, ignore the fake helpers, and cut the blast radius.
1 clickHow to spot a phishing email before you click
The sender, the link, and the rush: a practical check you can run in ten seconds.
1 clickHow does Bitcoin actually work?
No coin, no vault, just a public ledger since 2009. Where bitcoins come from, what a wallet really holds, the 21 million cap, halving, and why bitcoin is not anonymous.
0 clicksWindows 10 is out of support. The PC still boots.
Free security patches stopped in 2025. That is not a vibe. It is an open hole.
0 clicksWhat an operating system is actually doing
The landlord of the machine. Apps ask. Windows, macOS, Linux, and phones all answer.
0 clicksSilk Road, Tor, and the myth of being untraceable
A hidden shop, bitcoin, an arrest in a library. Anonymity was never a spell.
0 clicksNewly added
ILOVEYOU: a love letter that wrecked offices
May 2000. An attachment from someone you knew. The habit is still in the inbox.
0 clicksRead the log before you reinstall
Failed logins, full disks, wrong clocks. The text file is still the witness.
0 clicksLeast privilege: stop living as admin
Daily account for the browser, extra password for the system. Old hygiene for home machines.
0 clicksMan in the middle is just someone on the wire
Hostile WiFi, certificate warnings, and why clicking through a padlock alert is volunteering.
0 clicksHashing is not encryption
One way stamps for passwords, reversible locks for files. Unix got this right in /etc/shadow.
0 clicksSSH keys instead of a password on the box
A private file you keep, a public file on the server, and why password SSH is still a gift to scanners.
0 clicksWhat is a public IP address?
Not 192.168. The number websites see, how NAT hides the LAN, and why you should check it.
0 clicksDynamic IP vs static IP: which one you have and why it matters
Most home lines rotate. A static IP stays put. How to tell, and when to pay for stable.
0 clicksHow IP geolocation works (and why the pin is not your house)
City, region, country, and ISP are a database guess, useful for IP lookup, not GPS.
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