Some basic steps if you have a problem with your device.
Close all Apps & restart the App
Turn off Wifi & back on after 30 secs
Turn on Airplane mode & back off after 30 secs
Try another App/Browser
Make sure the Operating System & all Apps are up to date
Turn the device off & back on
Do some research on that particular error or problem (Google, or the support site)
Call into or phone the shop you bought it from
Phone your Warranty provider (if phone support is included eg. Applecare)
Troubleshooting Resources
iPad
Get help with hardware features on your iPhone, iPad, and iPod touch - Apple Support
Community: Using iPad | Apple Support Communities
8 Quick iPad Troubleshooting Techniques - For Dummies
7 common iPad problems and how to fix them
How to Fix Common iPad Problems | Gazelle
11 Common iPad Problems & How to Fix Them
iPad Air: 20 Common Problems and How to Fix Them | Digital Trends
Basic iPad Troubleshooting Tips - Fix Problems Yourself
iPhone - Contact Support - Apple Support
Apple - Support - AppleCare+ - iPad
Windows
Contact Support - Windows Help
Windows Network & Internet - Microsoft Community
Windows 10 - Microsoft Community
Apps on Windows 10 - Microsoft Community
OSX