i have iPad 1 and i forgot the password. please help

The lock screen passcode? See instructions in If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

The Apple ID/iCloud password? If you forgot your Apple ID password - Apple Support

If you have a first generation iPad - and are attempting a Factory Restore - you perhaps are fighting a lost cause.

The iPad1 is obsolete. Even if you manage to reactivate the iPad after the Factory Restore, you’ll discover that there are no compatible Apps available from the Apple App Store.