Would be prudent to meet in person with counsel of your choice as good moral character is at root of the issue

Will J1 sevis termination affect my future visa application?

As long as you can properly explain and it would not be a bad idea to provide a notarized affidavit at time of visa interview

I like to bring my nephew ( My Uncle son) to USA to work and stay for good?

Asked and answered 2x. If he is eligible perhaps an employment based visa but need to discuss with an attorney

Singaporean Immigration work visa?

Depends on your qualifications; which need to be discussed thoroughly with an immigration attorney of your preference

Do not send a duplicate filing. Consult in person with immigration counsel.

My green card expired more than 2 years can I renew it and how much will cost?

As stated, fee discussion is against forum policy. See an immigration attorney and file the correct paperwork for green card replacement.

New Card is Being Produced?

Make sure USCIS has your correct address on file.

Green card through marriage after employment-based GC got rejected

Your adjustment via your future US Citizen spouse will be adjudicated on ITS OWN merits and bona-fides. Work with competent immigration counsel,...

No attestation clause is necessary as are official documents; unless so instructed by the interviewer/embassy

I-485 "Fingerprint Review was completed" three times

Case is pending and being processed