Front End Development Libraries — freeCodeCamp

This is the certification freeCodeCamp puts after the HTML and CSS work and before the algorithms grind, and it covers five libraries in one run: Bootstrap, jQuery, Sass, React and Redux. Everything happens in freeCodeCamp's own browser editor with a test suite that has to go green before you move on.

The five certification projects are the real assessment. The rest of the coursework is technically optional — you can earn the certificate by building the projects alone if you already know the material, which is a more honest structure than most platforms manage.

What it covers

• Bootstrap — grid, components, and getting something responsive quickly
• jQuery — DOM manipulation the pre-framework way
• Sass — variables, nesting, mixins, and why CSS needed help
• React — components, props, state, lifecycle, forms
• Redux, then React and Redux together, ending in a store-backed app

The jQuery question

Nobody starts new projects with jQuery any more, and Bootstrap has lost enormous ground to Tailwind and to plain CSS grid. Two of the five sections here teach tools you are unlikely to choose. There's a defence — jQuery still runs on an enormous amount of the existing web and you will meet it in legacy code — but be clear that you're learning maintenance skills, not building skills, for that portion of the curriculum. The React section also leans on patterns older than the hooks-first approach react.dev now teaches.

Who it's for

Career-changers who want a free, verifiable certificate and a structured path with tests that actually run. The project-based assessment is the strong part: a random quote machine, a drum machine and a Redux app are small but real. Skip it if you already know React — the pacing will bore you and the Redux material is heavier than most teams now need. Skip the jQuery section outright unless you're specifically maintaining older code.

Our take

Free, verifiable, and structured, which is a rare combination. It's also visibly the oldest-feeling part of freeCodeCamp's curriculum, and the React coverage lags what React itself now documents. Do the Sass, React and Redux sections, build the five projects for the certificate, and treat Bootstrap and jQuery as history rather than technique.