In Windows 8.1 and Windows RT 8.1, most of the settings you'll want to change are in PC settings. You'll find things like screen resolution, adding and removing devices, personalising the lock screen, changing the date and time, and adding user accounts. If you don't see the setting you're looking for in PC settings, it might be in the Settings charm or Control Panel. For more info about where to find settings on your PC, see Where is Control Panel?
PC settings is organised into categories. Here are links to help for each category.
Personalize your PC
Getting the best display on your monitor
Connecting a second monitor or projector
Adding, removing and managing your devices and printers
Installing a printer
What if a wired device isn't installed properly?
Why isn't Windows finding my Bluetooth or other wireless device?
Install USB 3.0 and other USB devices
Mouse and keyboard: What's new in Windows
How to use the touch keyboard
Shutting down (turning off), sleeping or hibernating
Tips for freeing up drive space on your PC
Creating a user account
User accounts: FAQ
Assigned access: FAQ
Getting started with SkyDrive
Synchronising settings between PCs
Search, share, print, and more
How to search
How to manage notifications for Mail, Calendar and People
Choosing the applications Windows uses by default
What features does my app have permission to use?
Adding a device or PC to a network
Finding PCs, devices and content on your network
HomeGroup problems in Windows
Metered Internet connections: FAQ
Mobile broadband from start to finish
Unlocking or unblocking your mobile broadband device
Why can't I connect to the Internet?
Why can’t I connect to a network?
Why can’t I find a wireless network?
Why can’t I connect to other PCs?
Adding a language or keyboard
Input method editors (IMEs)
Clock options in Windows 8.1 and Windows RT 8.1
Making your PC easier to use
Hear text read aloud with Narrator
Using Magnifier to see items on the screen
Using the On-Screen Keyboard (OSK) to type
Using text or visual alternatives to sounds
Troubleshooting problems with installing updates
Windows Update: Frequently asked questions
Restoring files or folders using File History
Setting up a drive for File History
What if something goes wrong in File History?
How to refresh, reset or restore your PC
Getting help with activation errors
What is a product key?