we already covered CSS and Javascript, right? We did, but they’re both such a big part of front end development that a lot of other skills you’ll need are going to build off of them. CSS and JavaScript frameworks are collections of CSS or JS files that do a bunch of the work for you by providing common functionality (think logging into a website or searching a blog). Instead of starting with an EMPTY text document you start with a code file that has lots of awesome JS already in it.