Mozilla Developer

MDN Web Docs is an open-source, collaborative project documenting Web platform technologies, including CSS, HTML, JavaScript, and Web APIs. We also provide an extensive set of learning resources for beginning developers and students. MDN's mission is to provide a blueprint for a better internet and empower a new generation of developers and content creators to build it. We're always striving to connect developers more seamlessly with the tools and information they need to easily build projects on the open Web. Since our beginnings in 2005, Mozilla and the community have amassed around 45,000 pages of free, open-source content.

CSS Tricks

The largest web developer site on the internet. 3 billion pages displayed each year. 70 million visitors each month. We create simplified and interactive learning experiences. Learning web development should be easy to understand and available for everyone, everywhere! W3Schools is a school for web developers, covering all the aspects of web development.W3Schools has focus on simplicity. W3Schools practice easy learnin, uses simple code examples and simple illustrations of how to use it. W3Schools' tutorials start from basic level and move all the way up to professional references. W3Schools is, and will always be, a completely free developers resource. key.

freeCodeCamp

freeCodeCamp is a proven path to your first software developer job. More than 40,000 people have gotten developer jobs after completing this, including at big companies like Google and Microsoft. If you are new to programming, we recommend you start at the beginning and earn these certifications in order. To earn each certification, build its 5 required projects and get all their tests to pass. You can add these certifications to your résumé or LinkedIn. But more important than the certifications is the practice you get along the way. If you feel overwhelmed, that is normal. Programming is hard. Practice is the key.