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To add to this. For beginners it can be a pain to learn how to set your environment up to even begin developing.

https://codepen.io/ is a great place for front-end developers to hone their skills without having to worry about any of the setup.

You can use Pug (formerly Jade), Haml, Markdown, Slim, SCSS, Sass, LESS, PostCSS, Stylus, Coffeescript, Typescript, Livescript, Babel, or just plain HTML, CSS and JS without having to set up a thing.

Edit: I'm not affiliated with Codepen. I am however a user.