Public bookmarks

Python

• Python f-string cheat sheets

Django

• Classy Class-Based Views

C and C++

• Beej’s Guide to Network Programming
• C Programming for Beginners
• C Standard Library Reference Tutorial
• C Tutorial on zentut.com
• Learn C Programming. The Definitive Guide
• Learn C The Hard Way, github repository
• POSIX Threads Programming
• microHOWTO - Programming - C
• Creating a Rootkit to Learn C

Perl

• Perl tutorial

Mail

• Procmail Tips

Neomutt

• Email in the Terminal: Configuring Neomutt

Chat

XMPP

• Mcabber User Guide
  • archive

Makefile

• Learn Makefiles with the tastiest examples

Operating System

General

• Learning operating system development using Linux kernel and Raspberry Pi

Linux

• Linux Hardening Guide

OpenBSD

• Awesome OpenBSD list - github
• httpd and relayd on OpenBSD
  • archive.is
• Full list of services offered by a default OpenBSD installation

Raspberry

• LUKS on Raspberry Pi

Networks

• Linux Advanced Routing & Traffic Control
• Configuring IPv6 on your VPS
  • archive.is
  • google webcache
• A tcpdump Tutorial with Examples — 50 Ways to Isolate Traffic

SSH

• OpenSSH client side key management for better privacy and security

Vim

• Vim ve funkci textového editoru pro tvůrčí psaní (CZ)
• Fugitive.vim - resolving merge conflicts with vimdiff
• How to Do 90% of What Plugins Do (With Just Vim) - youtube

Databases

Postgres

• Postgres performance at any scale

Freelance

VAT / DPH

• Invoicing your clients on Upwork
  • archive

Finance

• Mastercard Currency Converter Calculator