Where can I find a reference for a programming language's syntax?

Every language has its own Application Programming Interface (API) which defines all its tooling and library features. Codecademy’s Glossaries highlight the most common features and syntax for a language’s API. They can serve as a useful guide when studying new languages or a handy reference when trying to remember tricky syntax.

Here are links to Codecademy’s Glossaries, to several language APIs and documentation for other tools used in Codecademy courses: