W3Schools
The world's largest online learning platform for web development, providing tutorials and online code editors for HTML, CSS, JavaScript, SQL, Python, etc.
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freeCodeCamp
The world's largest free programming learning community, providing a complete web development course route and certification, completely free.
Codecademy
An interactive programming learning platform that allows you to learn and practice in the browser, providing courses in Python, JavaScript, SQL, etc.
Runoob Tutorials
The most well-known introductory programming tutorial website in China, covering dozens of programming languages such as HTML, CSS, JavaScript, Python, Java, etc., with easy-to-understand content suitable for zero-based learning.