Linux

1. The Linux Kernel User's and Administrator's Guide

   Boot parameters, sysctl, module loading, and administering a running kernel.

2. Development Process

   How kernel development, patches and releases are organized.

3. Core API

   Core kernel data structures, memory allocation, locking primitives, and workqueues.

4. CPU Scheduler

   CFS/EEVDF scheduling, real-time policies, and scheduling classes.

5. Memory Management

   Virtual memory, page cache, swap, hugepages, NUMA and OOM handling.

6. Filesystems and the VFS

   Virtual filesystem layer, inodes, dentries, and mounting.

7. Block Layer

   Block devices, I/O schedulers, and request queues.

8. Networking

   Network stack, sockets, netfilter, traffic control and routing.

9. Control Groups v2

   Resource control for CPU, memory, I/O and PIDs via the cgroup hierarchy.

10. Namespaces and Containers

    Process, network, mount and user namespaces underpinning containers.

11. Security Subsystem

    Capabilities, LSM, SELinux/AppArmor, seccomp and credentials.

12. BPF and Tracing

    eBPF programs, maps, verifier and kernel tracing facilities.

13. Device Driver API

    Device model, drivers, interrupts and DMA.

14. Locking and Concurrency

    Spinlocks, mutexes, RCU and lock debugging.

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

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