The registry, NTFS, the security model, and the enterprise tooling behind Microsoft's OS.
Setting up Microsoft's free, browser-based server management console as a modern alternative to a growing collection of separate MMC snap-ins and Remote Desktop sessions.
Running an untrusted website in a hardware-isolated container that's automatically discarded afterward, instead of risking whatever a malicious page might do to your regular browsing session.
A complete walkthrough packaging and deploying an MSI installer to multiple computers automatically via Group Policy Software Installation — no third-party deployment tool required.
A complete walkthrough enabling Hyper-V and creating a working virtual machine — Windows' own native, type-1 hypervisor, built directly into Pro and Enterprise editions.
Setting up Just Enough Administration so a support team can run specific, pre-approved remote commands without ever holding full administrative rights on the target servers.
Declaring a machine's desired configuration state once, then letting PowerShell Desired State Configuration continuously enforce it, instead of manually re-applying settings after every drift.
Going beyond Task Manager's basic view to actually identify what a suspicious process is doing and what's launching automatically at startup, using two of the most useful free Sysinternals tools.
A complete walkthrough building an allow-list policy that only permits explicitly trusted applications to run — a meaningfully stronger control than antivirus scanning alone.
Deploying Windows Server Update Services to control which updates deploy where and when, instead of leaving every machine on a network to individually pull updates directly from Microsoft.
Microsoft retired the Internet Explorer 11 desktop application in favor of Edge, while quietly preserving IE-dependent legacy compatibility through Edge's own IE mode for years afterward.