BitDegree offers a ton of free courses that range from programming to game development. They offer standard online courses and gamified courses. Gamified courses help to bring achievements and interaction into the learning process. All you have to do is choose your language and start learning.
Coursera provides coding-based courses, tutorials, and resources taught by professors at leading universities. You’ll find hundreds of different coding-related courses to choose from. To develop these courses, they partnered with some of the best teachers at top-tier universities.
Code Academy is one of the most popular sites where people learn to code for free. More than 24 million people have learned to code using this platform. They offer courses ranging from introductory programming to more advanced languages.
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W3Schools has focus on simplicity. Also helps to make practice easy learning. W3Schools 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.