Interesting IT stuff I found

Ruby and Ruby on Rails

Rebuilding Rails, slides from Noah Gibbs on how to build your own web framework.

Poignant Guide To Ruby learn Ruby the funny way

Enumeration in Ruby inside enumeration in Ruby

Pattern matching pattern matching has been introduced in Ruby

How to fix slow code in Ruby

FrontEnd development

A guide to Flexbox

A guide to Grid

I’ve just discovered @counter-style CSS selector

General

Learn Vim the smart way

Vim cheatsheet

GNU Emacs reference card

How sustainable web design could help fight climate change

Markdown Emoji cheatsheet

C64 nostalgia Exclusive material about the C64

How a browser works

Markdwon Syntax Cheatsheet