I forgot my apple ID for my iPad

Check your web browser autofill entries, the Keychain, and other records, or use Apple's iForgot service, or contact their Account Security team, or if you're the unit's original owner, submit an unlock request as described in the Related Article above.

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If you attempted to restore it without knowing the password then it's in activation lock. If it says "activation locked" then you'll need to fill out the online form for Apple to remove the Activation lock. This requires proof of purchase.

You will need to use the following article, review and click on the link at the end of the article to start the request.

How to remove Activation Lock - Apple Support