What’s new in Windows 8.1 Update and Windows RT 8.1 Update?
How to Troubleshoot Problems in Windows 8.1 from www.online-tech-tips.com
Windows 8.1 review and instructions from techradar.com
The desktop lover's guide to supercharging Windows 8.1 - http://www.infoworld.com/
The Metro hater's guide to Windows 8.1 by Ed Bott
Articles introducing Windows 8 & 8.1 and their basic concepts
Getting Started Tutorials for Windows 8.1: Getting online; Microsoft account; Start screen; Getting around; Search, share, print & more; Apps; Email; Browse web; Personalize; SkyDrive
How to use Speech Recognition - Microsoft Windows Help - Windows 8
Windows 8.1 Frequently Asked Questions from GCFLearnFree.org. The YouTube video pinned here is from Microsoft.
Getting started tutorials for Windows - Microsoft Windows 8.1