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mdn web docs
authoritative frontend documentation covering html, css, js and web apis; an essential
reference
for developers worldwide.
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w3schools
globally known web tutorials for beginners, covering mainstream frontend and backend
technologies.
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devdocs.io
integrated documentation for major programming languages and frameworks, supports offline
access
and features a clean ui.
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api list
aggregates and indexes public apis across industries for easy discovery and integration.
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read the docs
a platform for hosting and automatically generating documentation for open source
projects.
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runoob
a popular chinese site for programming tutorials and development guides, covering
frontend,
backend, databases, and common languages.
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geeksforgeeks
well-known platform for programming tutorials and technical knowledge sharing, with an
extensive
interview question bank.
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java api docs
oracle's official java api documentation, covering java se and related libraries and
interfaces.