HTML

• HTML
• title
• link
• meta
• h1-h6
• p
• attributes
• em
• i
• strong
• b
• a
• span
• ul/ol/li
• comments
• br
• hr
• img
• div
• table, tr, td, th
• form, input, option, label, textarea, select
• section
• article
• aside
• header
• footer
• nav
• hgroup
• time
• figure/figcaption
• audio/video
• canvas
• svg

CSS

• CSS
• selectors
• comments
• width, height
• colors
• font
• margin/padding, box-sizing
• background
• gradients
• cursor
• border
• overflow
• display
• position
• z-index
• opacity
• user-select
• outline
• transform
• filter
• object-fit
• resize
• keyframes
• transition
• grid-view
• layout - grid
• layout - flexbox
• vars

JavaScript

• JavaScript
• variables - let, const
• operators
• arrow functions
• for, while, do while...
• if, switch
• array
• DOM
• date
• oop - ecmascript 6+
• cookies
• json
• axios/fetch
• lodash
• brain.js
• TensorFlow.js - pretrained models
• p5.js
• Angular/React/Vue

Other

• stackoverflow
• css frameworks
• css preprocessors
• google fonts
• font awesome
• git, github