I am learning:
Vim demystified
Vim is a very powerful text editor that has many commands. This material is designed to describe enough of the commands that you will be able to easily use Vim as an all-purpose text editor.
Keyboard Shortcuts for Bash
Bash is one of the most popular shells on the Linux operating systems. There are a couple of important hotkeys that you should get familiar with if you plan to spend a lot of time at the command line. These shortcuts will save you a ton of time if you learn them.
Cascading Style Sheets (CSS), Javascript
Specific examples of CSS and Javascript, hacks (IE6-IE7). Fiszki CSS, Javascript.
XHTML 1.0 tags
XHTML 1.0 tags (W3C), code examples for beginners, tagi xhtml dla przypomnienia, http://www.w3schools.com/tags/default.asp
Advanced English vocabulary
The goal of this stack is to improve your English vocabulary and to take you to an advanced level of knowledge of English words and phrases.