ECMAScript (ECMA-262)

1. Overview and source text

   Language overview and source text code points.

2. Notational conventions

   Grammar notation, algorithm conventions and abstract operations.

3. Data types and values

   Language types and specification types such as Reference and Completion Record.

4. Abstract operations

   ToPrimitive, ToNumber, equality comparison and type conversion.

5. Executable code and execution contexts

   Environment records, realms, job queues and the agent model.

6. Ordinary and exotic objects

   Internal methods, property descriptors, prototype chain and exotic objects.

7. Lexical grammar

   Tokens, automatic semicolon insertion and literals.

8. Expressions

   Operators, evaluation order and optional chaining.

9. Statements and declarations

   let/const/var, hoisting, loops and exceptions.

10. Functions and classes

    Arrow functions, generators, async functions and class definitions.

11. Scripts and modules

    Module records, import/export, linking and top-level await.

12. Promises and async

    Promise semantics, job queue ordering and async function objects.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.