Forget about Apple id

See: If you forgot your Apple ID  https://support.apple.com/en-us/HT201354  and

 If you forgot your Apple ID password https://support.apple.com/en-us/HT201487

You also can use Having trouble signing in/iForgot  https://iforgot.apple.com/password/verify/appleid 

And, you are likely to need to see If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485

Perhaps this article will help:

If you forgot your Apple ID - Apple Support