Lua

1. Basic Concepts

   Values and types, environments, error handling, metatables, and coroutines overview.

2. Values and Types

   Nil, boolean, number, string, function, userdata, thread, and table types.

3. Metatables and Metamethods

   Operator overloading and customizing table behavior via metamethods.

4. Garbage Collection

   Incremental and generational collectors, weak tables, and finalizers.

5. Coroutines

   Cooperative multitasking with coroutines.

6. The Language

   Lexical conventions, variables, statements, expressions, and scoping.

7. The C API

   The stack, embedding Lua, and calling between C and Lua.

8. Standard Libraries

   Basic functions, string, table, math, io, os, and utf8 libraries.

9. Modules and require

   Loading modules with require, package.path, and searchers.

10. String Manipulation and Patterns

    String functions, pattern matching, and string.format.

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

Source: endoflife.date