I forgot my Apple ID and password for second iPhone please can you help me

 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 could also use Having trouble signing in/iForgot https://iforgot.apple.com/password/verify/appleid for both.

I think you also will end up needing If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485

Go here if you need additional support Apple telephone support https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

For worldwide Apple ID support go here https://support.apple.com/en-us/HT204169