How to use your iPad as a second monitor for your Windows computer

To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.

How to use your iPad as a second display for your Mac computer without any wires or add-ons

You can use your iPad as a second display for your Mac through the Sidecar feature, which comes pre-installed.
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Using iPad Recovery Mode to Fix a Frozen or Unresponsive Device

Recovery Mode: Connect iPad to a computer > open Finder (Catalina or later) or iTunes > restart > Update from the recovery screen. If you don't have access to a computer, use iCloud to wipe the iPad ...