Microsoft PowerToys documentation — by Microsoft Learn

The safe ways to shrink the component store: the StartComponentCleanup task, DISM /StartComponentCleanup (with an optional /ResetBase) and Disk Cleanup. It also warns why you must never delete WinSxS files by hand.

Microsoft's list of Windows features that are no longer being developed and may be removed, such as Steps Recorder. Check it before relying on an older tool or tweak.

The companion list of features Microsoft has actually removed, with dates, for example WMIC and PowerShell 2.0. If a guide's command no longer works, look here first.