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Operating Systems — from first principles to interview-ready
A complete, self-contained learning track. No prior operating-systems theory assumed — only that you have used Linux.
Every module builds strictly on the ones before it, and every concept carries a runnable exercise with the expected output hidden behind a toggle, so you can attempt it before you peek.
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Module 01 — Kernel, User Space & the System Call Boundary
Module 02 — Processes, fork/exec & Process States
Module 03 — File Descriptors, Inodes & Filesystems
Module 04 — Signals, Sessions & Job Control
Module 05 — Boot & Init: Firmware to systemd
Module 06 — Threads, Races & Deadlock
Module 07 — CPU Scheduling, nice & Load Average
Module 08 — Virtual Memory, Paging & Page Faults
Module 09 — Page Cache, Swap & the OOM Killer
Module 10 — I/O, the Block Layer & iowait
Module 11 — IPC: Pipes, Sockets & Shared Memory
Module 12 — Namespaces, cgroups & Containers