In Finder, select your iPad under Locations. Choose Update (to reinstall iOS without erasing data) or Restore (to erase everything). Follow these steps for macOS Mojave or earlier (using iTunes ...

If you synced your iPad to iTunes on your PC, whether to transfer music and movies to it or back the device up on your computer, you can restore it using the PC. However, you must have trusted ...

you'll have the opportunity to restore a previous backup or set it up as a new iPad. How to use a synced computer with iTunes to reset your iPad If you have previously synced your iPad with iTunes ...