It looks like you're interested in IT Pro topics for Windows 8 or Windows 8.1. We're no longer updating that content regularly, but Windows 8 and Windows 8.1 are still supported.
- Windows 8 / 8.1 previous versions documentation has technical content for IT Pros, or people managing desktops.
- Windows previous version documentation has IT Pro-focused content for previous versions of Windows.
- Microsoft Lifecycle Policy has info about the availability of support throughout the life of a product.