The registry, NTFS, the security model, and the enterprise tooling behind Microsoft's OS.
Released August 24, 1995, Windows 95 brought the Start menu and taskbar to the mainstream, backed by one of the largest software marketing campaigns ever mounted.
Released July 27, 1993, Windows NT 3.1 was the first shipping version of the from-scratch, Dave Cutler-led OS underlying every Windows release since.
Announced June 24, 2021 by Panos Panay and released October 5, 2021, Windows 11 brought a redesigned interface and stricter hardware requirements.
First revealed via Windows 10 Insider Preview Build 14316 on April 6, 2016, WSL let Windows run real Linux binaries for the first time.
How NTFS's Master File Table, transaction journal, and lesser-known features like alternate data streams and the USN journal actually work.
How WinRM and PowerShell Remoting turn scattered single-machine administration into fleet-wide scripted management across hundreds of servers.
How the Windows kernel represents processes as containers of handles and a security token, and the tools to inspect both live.
How the registry's hive files, keys, and value types work under the hood, and the tools to inspect and edit them safely.
How the Service Control Manager starts, stops, and supervises background processes, and how to configure and debug a service directly.
How Task Scheduler's triggers, actions, and conditions work together, and how to build and inspect scheduled tasks from the command line.