How do I sync my ipad with my computer/ windows

Sync in what way? What exactly are you trying to accomplish?

You can use iTunes to sync things like Music, Movies, Videos from your iTunes Library to the iPad.

See here: link-> Use iTunes to sync your iPhone, iPad, or iPod with your computer - Apple Support

If you use iCloud for Windows and the Microsoft Outlook email app you can also sync contacts and email.

link-> https://support.microsoft.com/en-us/office/use-icloud-for-windows-to-synchronize-mail-calendar-and-contacts-with-outlook-5f9a9b02-4726-4f64-b2ce-478c1f8f3ef2