HTML
  1. Programming basics
  2. Introduction
  3. Basics
  4. Lists and tables
  5. Form controls
  6. Multimedia
  7. Friendly adresses and webfonts
CSS
  1. Basics
  2. Pseudo-classes, pseudo-elements, and inheritance
  3. Semantics - HTML5
  4. Element positioning and Flexbox
  5. Animations
  6. Image filters
  7. Responsiveness using CSS
  8. Responsiveness using Bootstrap
JavaScript
  1. Basics
  2. Operators
  3. Loops
  4. Conditional statements
  5. Arrays
  6. Functions
  7. Strings, dates, math, and APIs
  8. OOP concept
  9. The DOM tree of objects
  10. Form controls and events
  11. A simple game (intervals, listeners, arrow functions)
PHP (a deprecated language)
  1. Basics
  2. Forms