HTML

HyperText Markup Language
Used for creating documents on the web
Document structure
Semantic HTML

CSS

Cascading Style Sheets
Used to style HTML pages
class vs id

Basic styling:

h1 {
    color: blue;
    background-color: yellow;
}
.red-bg {
    background-color: red;
}

pseudo classes/elements
positioning
flex
structuring (modularity)

Javascript

Created in 10 days!

Basics

Variables: let, const and var

The function keyword:

function addOne(number) {
    return number + 1;
}

Objects
Arrays

Arrow functions:

const addOne = (number) => {
    return number + 1;
};
const addOne = (number) => number + 1;
const addOne = number =>  number + 1;

functional programming - map, filter

Advanced

callbacks: setTimeout vagerah
promises
async await
fetchAPI
local/session storage
dom