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, personalizing 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 organized into categories. Here are links to help for each category.
Personalize your PC
Get the best display on your monitor
Connect a second monitor or projector
Add, remove, and manage your devices and printers
Install 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
Shut down (turn off), sleep, or hibernate
Tips to free up drive space on your PC
Create a user account
User accounts: FAQ
Assigned access: FAQ
Getting started with SkyDrive
Sync settings between PCs
Search, share, print, and more
How to search
How to manage notifications for Mail, Calendar, and People
Choose the apps Windows uses by default
What features does my app have permission to use?
Add a device or PC to a network
Find PCs, devices, and content on your network
HomeGroup problems in Windows
Metered Internet connections: FAQ
Mobile broadband from start to finish
Unlock or unblock 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?
Add a language or keyboard
Input method editors (IMEs)
Clock options in Windows 8.1 and Windows RT 8.1
Make your PC easier to use
Hear text read aloud with Narrator
Use Magnifier to see items on the screen
Use the On-Screen Keyboard (OSK) to type
Use text or visual alternatives to sounds
Troubleshoot problems with installing updates
Windows Update: Frequently asked questions
Restore files or folders using File History
Set up a drive for File History
What if something goes wrong in File History?
How to refresh, reset, or restore your PC
Get help with activation errors
What is a product key?