Zig

1. Variables and Types

   Const and var declarations, primitive types, and type coercion.

2. Structs, Enums, and Unions

   Aggregate types, tagged unions, packed layouts, and methods.

3. Pointers and Slices

   Single-item and many-item pointers, slices, and sentinels.

4. Memory and Allocators

   Explicit allocation, allocator interfaces, and lifetime management.

5. Errors and Optionals

   Error sets, error unions, try and catch, and optional types.

6. comptime

   Compile-time execution, generics via comptime, and type reflection.

7. Control Flow

   Loops, switch, defer and errdefer, and labeled blocks.

8. Build System

   build.zig, modules, build steps, and cross-compilation.

9. C Interop

   Importing C headers, extern functions, and calling convention.

10. Illegal Behavior and Safety

    Safety checks, build modes, and detectable illegal behavior.

11. Atomics and Threads

    Atomic operations and threading primitives.

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