Runoob (菜鸟教程)

Runoob publishes basic tutorials on programming languages and technologies including HTML, CSS, JavaScript, Python, Java, Ruby, C, PHP and MySQL, alongside online examples that readers can use to practice. Its site is organized into sections covering Python and data science, AI and intelligent development, front-end and back-end development, databases, mobile development, DevOps, programming languages and computer fundamentals.

Tools on the site include manuals for HTML, JavaScript, CSS and PostgreSQL, quizzes covering HTML, HTML5, XHTML, CSS, JavaScript, jQuery, XML, ASP, PHP, SQL and Python, and a local bookmarks feature for saved references.