i forgot my password for my ipad

If you actually forgot the Passcode needed to open and use your iPad …

… your ONLY option is to perform a “reset” - which completely erases the iPad - followed by “restoring” from an available backup as described in article linked below.

You will need your AppleID credentials.

If you see an iPhone or iPad unavailable message or Security Lockout screen – Apple Support (AU)

NOTE: If you’re running an iPadOS prior to 15.2, follow the instructions linked near the bottom of the article.