Found and saved useful links
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Linux tips and instructions
Linux Upskill Challenge
DebianAdmin (overall Debian manuals)
Linux SysOps Handbook
Bash scripting manual
The Geeky Way: Linux
Linux Package Management Comparison
Linux Package Management Comparison [Arch Wiki]
Ubuntu Package Management
Deb repositories sources.list
Apt cheat sheet
AppImage on Linux
Bash history management
Job scheduling: cron and at
Job scheduling: systemd-timers
Unix Less Command
Remove spaces from filenames
Firewall: iptables basic rules
Firewall: UFW
Firewall: iptables logging
Permanent blocking with fail2ban
Cockpit System Monitoring + Nginx
PAM-U2F Yubikey (local Linux account)
Increasing partition without reboot (without LVM)
[Arch Linux] Yubikey+LUKS
[Debian] Yubikey+LUKS
LUKS unlocking with FIDO2, TPM and PKCS#11
Other configuration/usage manuals
Baszarek Wiki - Linux, software, scripting and configuration tips [PL]
Git documentation (+ Pro Git book online)
Darcs Version Control
Use The Index, Luke - database guides
Encypted backups for safe cloud storage [PL]
File encryption with OpenSSL
GPG Subkeys
Offline master GPG key
Import GPG keys from specified servers
SSH keys randomart
DrDuh's Great Yubikey Guide
Decoding Base64 in command line
Flexbox in CSS
Extremal backward compatibility in websites
Starting blog with HUGO
Arpspoof basic usage
PKCS#11 URI scheme
OpenSSL CA/PKI guide
SSL CRL reasons
OpenSSL and ECC keys
Opensc (Smart card tools)
YubiKey [multiple] challenge-response configuration
Nitrokey HSM first steps
Nitrokey HSM + Smard Card Shell
Some online tools and resources
Base64 encode/decode
QR code generator [PL]
GNU Packages Checker
HTML colors
Characters and symbols in CSS/HTML
HUGO (website/blog generator)
MKWS (simple site generation)
Matrix Federation Tester
Introduction to Gemini protocol
Privacy-related
Dangerous Privacy/Security Myths
Privacy Cookbook
PrivacyTools
PrismBreak (Non-trusted apps and more privacy-friendly alternatives)
DeviceInfo - check information about system, browser, network and settings
Joinfediverse Wiki - avoiding Big Tech manuals + links to further resources
IP, DNS and information leak checker
Browserleaks - check leaked information
AmIUnique (browser fingerprint)
Online accounts deletion: JustDeleteMe
Online accounts deletion: AccountKiller
Internet Noise Generator (+links to other tips)
NoMoreGoogle (Google services alternatives)
Pi-Hole (blocking unwanted domains)
GNUnet
Fediverse - decentralized social media networks
Self-hosted Searx search engine
Why you should't trust Discord
Debian Paranoid Security Guide
SecurityInABox - Security guide
Liberate Android system
Exodus (Android apps privacy)
TheyTrackYou (privacy-related news + further links + some practical tips)
TheTinHat (articles + tutorials)
Email protection tips (by FSF)
Don't use Windows 10
Atlas of Surveillance (by EFF)
Companies buying/selling personal data/profiles
Glenn Greenwald - Why Privacy Matters (TED talk)
The Eternal Value of Privacy
TheNewOil - value of data
Children's Privacy vs Social Media
Privacy/security/OSINT podcast
ChoosePrivacyEveryday (Articles + links to further resources)
About end-to-end encryption in messengers
Privacy International
Richard Stallman's personal site
Yarmo Mackenbach's blog about privacy and decentralization
MyShadow - about digital traces
It will be constantly updated...